Periodic Table

Explore key information about the chemical elements through this periodic table | Group | 1 | 2 | | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | Period | | 1 | 1H1.008 | | 2He4.0026 | 2 | 3Li6.94 | 4Be9.0122 | | 5B10.81 | 6C12.011 | 7N14.007 | 8O15.999 | 9F18.998 | 10Ne20.180 | 3 | 11Na22.990 | 12Mg24.305 | | 13Al26.982 | 14Si28.085 | 15P30.974 | 16S32.06 | 17Cl35.45 | 18Ar39.948 | 4 | 19K39.098 | 20Ca40.078 | | 21Sc44.956 | 22Ti47.867 | 23V50.942 | 24Cr51.996 | 25Mn54.938 | 26Fe55.845 | 27Co58.933 | 28Ni58.693 | 29Cu63.546 | 30Zn65.38 | 31Ga69.723 | 32Ge72.63 | 33As74.922 | 34Se78.96 | 35Br79.904 | 36Kr83.798 | 5 | 37Rb85.468 | 38Sr87.62 | | 39Y88.906 | 40Zr91.224 | 41Nb92.906 | 42Mo95.96 | 43Tc[97.91] | 44Ru101.07 | 45Rh102.91 | 46Pd106.42 | 47Ag107.87 | 48Cd112.41 | 49In114.82 | 50Sn118.71 | 51Sb121.76 | 52Te127.60 | 53I126.90 | 54Xe131.29 | 6 | 55Cs132.91 | 56Ba137.33 | * | 71Lu174.97 | 72Hf178.49 | 73Ta180.95 | 74W183.84 | 75Re186.21 | 76Os190.23 | 77Ir192.22 | 78Pt195.08 | 79Au196.97 | 80Hg200.59 | 81Tl204.38 | 82Pb207.2 | 83Bi208.98 | 84Po[208.98] | 85At[209.99] | 86Rn[222.02] | 7 | 87Fr[223.02] | 88Ra[226.03] | ** | 103Lr[262.11] | 104Rf[265.12] | 105Db[268.13] | 106Sg[271.13] | 107Bh[270] | 108Hs[277.15] | 109Mt[276.15] | 110Ds[281.16] | 111Rg[280.16] | 112Cn[285.17] | 113Uut[284.18] | 114Fl[289.19] | 115Uup[288.19] | 116Lv[293] | 117Uus[294] | 118Uuo[294] | | | *Lanthanoids | * | 57La138.91 | 58Ce140.12 | 59Pr140.91 | 60Nd144.24 | 61Pm[144.91] | 62Sm150.36 | 63Eu151.96 | 64Gd157.25 | 65Tb158.93 | 66Dy162.50 | 67Ho164.93 | 68Er167.26 | 69Tm168.93 | 70Yb173.05 | | **Actinoids | ** | 89Ac[227.03] | 90Th232.04 | 91Pa231.04 | 92U238.03 | 93Np[237.05] | 94Pu[244.06] | 95Am[243.06] | 96Cm[247.07] | 97Bk[247.07] | 98Cf[251.08] | 99Es[252.08] | 100Fm[257.10] | 101Md[258.10] | 102No[259.10] | |
The periodic table is a table of the chemical elements in which the elements are arranged by order of atomic number in such a way that the periodic properties (chemical periodicity) of the elements are made clear. The standard form of the table includes periods (usually horizontal in the periodic table) and groups (usually vertical). Elements in groups have some similar properties to each other. There is no one single or best structure for the periodic table but by whatever consensus there is, the form used here is very useful. The periodic table is a masterpiece of organised chemical information. The evolution of chemistry's periodic table into the current form is an astonishing achievement with major contributions from many famous chemists and other eminent scientists. -------------------------------------------------
Table: basic information about and classifications of hydrogen. | * Name: Hydrogen * Symbol: H * Atomic number: 1 * Atomic weight: 1.00794 (7) [see notes gm r] * Standard state: gas at 298 K * CAS Registry ID: 1333-74-0 | * Group in periodic table: 1 * Group name: (none) * Period in periodic table: 1 * Block in periodic table: s-block * Colour: colourless * Classification: Non-metallic |
Hydrogen was discovered by Henry Cavendish at 1766 in London, England.Origin of name: from the Greek words "hydro" and "genes" meaning "water" and "generator". -------------------------------------------------
Table: basic information about and classifications of lithium. | * Name: Lithium * Symbol: Li * Atomic number: 3 * Atomic weight: [ 6.941 (2)] [see notes gm r] * Standard state: solid at 298 K * CAS Registry ID: 7439-93-2 | * Group in periodic table: 1 * Group name: Alkali metal * Period in periodic table: 2 * Block in periodic table: s-block * Colour: silvery white/grey * Classification: Metallic |
Lithium was discovered by Johan August Arfvedson at 1817 in Stockholm, Sweden.Origin of name: from the Greek word "lithos" meaning "stone", apparently because it was discovered from a mineral source whereas the other two common Group 1 elements, sodium and potassium, were discovered from plant sources.. -------------------------------------------------
Table: basic information about and classifications of sodium. | * Name: Sodium * Symbol: Na * Atomic number: 11 * Atomic weight: 22.98976928 (2) * Standard state: solid at 298 K * CAS Registry ID: 7440-23-5 | * Group in periodic table: 1 * Group name: Alkali metal * Period in periodic table: 3 * Block in periodic table: s-block * Colour: silvery white * Classification: Metallic |
Sodium was discovered by Sir Humphrey Davy at 1807 in England. Origin of name: from the English word "soda" (the origin of the symbol Na comes from the Latin word "natrium"). -------------------------------------------------
Table: basic information about and classifications of potassium. | * Name: Potassium * Symbol: K * Atomic number: 19 * Atomic weight: 39.0983 (1) * Standard state: solid at 298 K * CAS Registry ID: 7440-09-7 | * Group in periodic table: 1 * Group name: Alkali metal * Period in periodic table: 4 * Block in periodic table: s-block * Colour: silvery white * Classification: Metallic |
Potassium was discovered by Sir Humphrey Davy at 1807 in England. Origin of name: from the English word "potash" (pot ashes) and the Arabic word "qali" meaning alkali (the origin of the symbol K comes from the Latin word "kalium"). -------------------------------------------------
Table: basic information about and classifications of rubidium. | * Name: Rubidium * Symbol: Rb * Atomic number: 37 * Atomic weight: 85.4678 (3) [see noteg] * Standard state: solid at 298 K * CAS Registry ID: 7440-17-7 | * Group in periodic table: 1 * Group name: Alkali metal * Period in periodic table: 5 * Block in periodic table: s-block * Colour: silvery white * Classification: Metallic |
Rubidium was discovered by Robert Bunsen, Gustav Kirchhoff at 1861 in Germany. Origin of name: from the Latin word "rubidius" meaning "dark red" or "deepest red". -------------------------------------------------
Table: basic information about and classifications of caesium. | * Name: Caesium * Symbol: Cs * Atomic number: 55 * Atomic weight: 132.9054519 (2) * Standard state: solid at 298 K (but melts only slightly above this temperature) * CAS Registry ID: 7440-46-2 | * Group in periodic table: 1 * Group name: Alkali metal * Period in periodic table: 6 * Block in periodic table: s-block * Colour: silvery gold * Classification: Metallic |
Caesium was discovered by Gustav Kirchhoff, Robert Bunsen at 1860 in Germany. Origin of name: from the Latin word "caesius" meaning "sky blue" or "heavenly blue".

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Table: basic information about and classifications of francium. | * Name: Francium * Symbol: Fr * Atomic number: 87 * Atomic weight: [ 223 ] * Standard state: solid at 298 K * CAS Registry ID: 7440-73-5 | * Group in periodic table: 1 * Group name: Alkali metal * Period in periodic table: 7 * Block in periodic table: s-block * Colour: metallic * Classification: Metallic |
Francium was discovered by Marguerite Perey at 1939 in France. Origin of name: named after "France". -------------------------------------------------
Table: basic information about and classifications of beryllium. | * Name: Beryllium * Symbol: Be * Atomic number: 4 * Atomic weight: 9.012182 (3) * Standard state: solid at 298 K * CAS Registry ID: 7440-41-7 | * Group in periodic table: 2 * Group name: Alkaline earth metal * Period in periodic table: 2 * Block in periodic table: s-block * Colour: lead grey * Classification: Metallic |
Beryllium was discovered by Nicholas Louis Vauquelin (1763-1829) at 1797 in France. Origin of name: from the Greek word "beryllos" meaning "beryl". -------------------------------------------------
Table: basic information about and classifications of magnesium. | * Name: Magnesium * Symbol: Mg * Atomic number: 12 * Atomic weight: 24.3050 (6) * Standard state: solid at 298 K * CAS Registry ID: 7439-95-4 | * Group in periodic table: 2 * Group name: Alkaline earth metal * Period in periodic table: 3 * Block in periodic table: s-block * Colour: silvery white * Classification: Metallic |
Magnesium was discovered by Sir Humphrey Davy at 1755 in England. Origin of name: from the Greek word "Magnesia", a district of Thessaly. -------------------------------------------------
Table: basic information about and classifications of calcium. | * Name: Calcium * Symbol: Ca * Atomic number: 20 * Atomic weight: 40.078 (4) [see noteg] * Standard state: solid at 298 K * CAS Registry ID: 7440-70-2 | * Group in periodic table: 2 * Group name: Alkaline earth metal * Period in periodic table: 4 * Block in periodic table: s-block * Colour: silvery white * Classification: Metallic |
Calcium was discovered by Sir Humphrey Davy at 1808 in England. Origin of name: from the Latin word "calx" meaning "lime". -------------------------------------------------
Table: basic information about and classifications of strontium. | * Name: Strontium * Symbol: Sr * Atomic number: 38 * Atomic weight: 87.62 (1) [see notes gr] * Standard state: solid at 298 K * CAS Registry ID: 7440-24-6 | * Group in periodic table: 2 * Group name: Alkaline earth metal * Period in periodic table: 5 * Block in periodic table: s-block * Colour: silvery white * Classification: Metallic |
Strontium was discovered by Adair Crawford at 1790 in Scotland. Origin of name: named after the village of "Strontian" in Scotland. -------------------------------------------------
Table: basic information about and classifications of barium. | * Name: Barium * Symbol: Ba * Atomic number: 56 * Atomic weight: 137.327 (7) * Standard state: solid at 298 K * CAS Registry ID: 7440-39-3 | * Group in periodic table: 2 * Group name: Alkaline earth metal * Period in periodic table: 6 * Block in periodic table: s-block * Colour: silvery white * Classification: Metallic |
Barium was discovered by Sir Humphrey Davy at 1808 in England. Origin of name: from the Greek word "barys" meaning "heavy". -------------------------------------------------
Table: basic information about and classifications of radium. | * Name: Radium * Symbol: Ra * Atomic number: 88 * Atomic weight: [ 226 ] * Standard state: solid at 298 K * CAS Registry ID: 7440-14-4 | * Group in periodic table: 2 * Group name: Alkaline earth metal * Period in periodic table: 7 * Block in periodic table: s-block * Colour: metallic * Classification: Metallic |
Radium was discovered by Pierre and Marie Curie at 1898 in France. Origin of name: from the Latin word "radius" meaning "ray". -------------------------------------------------
Table: basic information about and classifications of scandium. | * Name: Scandium * Symbol: Sc * Atomic number: 21 * Atomic weight: 44.955912 (6) * Standard state: solid at 298 K * CAS Registry ID: 7440-20-2 | * Group in periodic table: 3 * Group name: (none) * Period in periodic table: 4 * Block in periodic table: d-block * Colour: silvery white * Classification: Metallic |
Scandium was discovered by Lars Fredrik Nilson at 1879 in Sweden. Origin of name: from the Latin word "Scandia" meaning "Scandinavia". -------------------------------------------------
Table: basic information about and classifications of yttrium. | * Name: Yttrium * Symbol: Y * Atomic number: 39 * Atomic weight: 88.90585 (2) * Standard state: solid at 298 K * CAS Registry ID: 7440-65-5 | * Group in periodic table: 3 * Group name: (none) * Period in periodic table: 5 * Block in periodic table: d-block * Colour: silvery white * Classification: Metallic |
Yttrium was discovered by Johann Gadolin at 1794 in Finland. Origin of name: named after the village of "Ytterby" near Vaxholm in Sweden.

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Table: basic information about and classifications of lutetium. | * Name: Lutetium * Symbol: Lu * Atomic number: 71 * Atomic weight: 174.9668 (1) [see noteg] * Standard state: solid at 298 K * CAS Registry ID: 7439-94-3 | * Group in periodic table: 3 * Group name: (none) * Period in periodic table: 6 * Block in periodic table: d-block * Colour: silvery white * Classification: Metallic |
Lutetium was discovered by Georges Urbain and Carl Auer von Welsbach at 1907 in France, Germany. Origin of name: from the Greek word "Lutetia" meaning "Paris". -------------------------------------------------
Table: basic information about and classifications of lawrencium. | * Name: Lawrencium * Symbol: Lr * Atomic number: 103 * Atomic weight: [ 262 ] * Standard state: presumably a solid at 298 K * CAS Registry ID: 22537-19-5 | * Group in periodic table: 3 * Group name: (none) * Period in periodic table: 7 * Block in periodic table: d-block * Colour: unknown, but probably metallic and silvery white or grey in appearance * Classification: Metallic |
Lawrencium was discovered by Albert Ghiorso, Torbjorn Sikkeland, Almon Larsh, Robert M. Latimer at 1961 in United States.Origin of name: temporary IUPAC nomenclature. The origin of the Amercian Chemical Society preferred name is Ernest O. "Lawrence", inventor of the cyclotron. -------------------------------------------------
Table: basic information about and classifications of lanthanum. | * Name: Lanthanum * Symbol: La * Atomic number: 57 * Atomic weight: 138.90547 (7) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7439-91-0 | * Group in periodic table: * Group name: Lanthanoid * Period in periodic table: 6 (lanthanoid) * Block in periodic table: f-block * Colour: silvery white * Classification: Metallic |
Lanthanum was discovered by Carl Gustaf Mosander at 1839 in Sweden.Origin of name: from the Greek word "lanthanein" meaning "to lie hidden". -------------------------------------------------
Table: basic information about and classifications of actinium. | * Name: Actinium * Symbol: Ac * Atomic number: 89 * Atomic weight: [ 227 ] * Standard state: solid at 298 K * CAS Registry ID: 7440-34-8 | * Group in periodic table: * Group name: Actinoid * Period in periodic table: 7 (actinoid) * Block in periodic table: f-block * Colour: silvery * Classification: Metallic |
Actinium was discovered by Andre Debierne at 1899 in France. Origin of name: from the Greek word "aktinos" meaning "ray". -------------------------------------------------
Table: basic information about and classifications of titanium. | * Name: Titanium * Symbol: Ti * Atomic number: 22 * Atomic weight: 47.867 (1) * Standard state: solid at 298 K * CAS Registry ID: 7440-32-6 | * Group in periodic table: 4 * Group name: (none) * Period in periodic table: 4 * Block in periodic table: d-block * Colour: silvery metallic * Classification: Metallic |
Titanium was discovered by William Gregor at 1791 in England. Origin of name: named after the "Titans", (the sons of the Earth goddess in Greek mythology). -------------------------------------------------
Table: basic information about and classifications of zirconium. | * Name: Zirconium * Symbol: Zr * Atomic number: 40 * Atomic weight: 91.224 (2) * Standard state: solid at 298 K * CAS Registry ID: 7440-67-7 | * Group in periodic table: 4 * Group name: (none) * Period in periodic table: 5 * Block in periodic table: d-block * Colour: silvery white * Classification: Metallic |
Zirconium was discovered by Martin Heinrich Klaproth at 1789 in Berlin, Germany. Origin of name: from the Arabic word "zargun" meaning "gold colour". -------------------------------------------------
Table: basic information about and classifications of hafnium. | * Name: Hafnium * Symbol: Hf * Atomic number: 72 * Atomic weight: 178.49 (2) * Standard state: solid at 298 K * CAS Registry ID: 7440-58-6 | * Group in periodic table: 4 * Group name: (none) * Period in periodic table: 6 * Block in periodic table: d-block * Colour: grey steel * Classification: Metallic |
Hafnium was discovered by Dirk Coster and George Charles von Hevesy at 1923 in Denmark. Origin of name: from the Latin name "Hafnia" meaning "Copenhagen". -------------------------------------------------
Table: basic information about and classifications of rutherfordium. | * Name: Rutherfordium * Symbol: Rf * Atomic number: 104 * Atomic weight: [ 265 ] * Standard state: presumably a solid at 298 K * CAS Registry ID: 53850-36-5 | * Group in periodic table: 4 * Group name: (none) * Period in periodic table: 7 * Block in periodic table: d-block * Colour: unknown, but probably metallic and silvery white or grey in appearance * Classification: Metallic |
Rutherfordium was discovered by Workers at the Nuclear Institute at Dubna, and the University of California, Berkeley, USA. at 1964 in USSR, United States.Origin of name: the origin of the Amercian Chemical Society preferred name is Lord "Rutherford", the physicist and chemist from New Zealand.. -------------------------------------------------
Table: basic information about and classifications of cerium. | * Name: Cerium * Symbol: Ce * Atomic number: 58 * Atomic weight: 140.116 (1) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7440-45-1 | * Group in periodic table: * Group name: Lanthanoid * Period in periodic table: 6 (lanthanoid) * Block in periodic table: f-block * Colour: silvery white * Classification: Metallic |
Cerium was discovered by Wilhelm von Hisinger, Jöns Jacob Berzelius, Martin Klaproth at 1803 in Sweden, Germany.Origin of name: named after the asteroidCeres which discovered in 1801, 2 years before the element. -------------------------------------------------
Table: basic information about and classifications of thorium. | * Name: Thorium * Symbol: Th * Atomic number: 90 * Atomic weight: 232.03806 (2) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7440-29-1 | * Group in periodic table: * Group name: Actinoid * Period in periodic table: 7 (actinoid) * Block in periodic table: f-block * Colour: silvery white * Classification: Metallic |
Thorium was discovered by Jöns Berzelius at 1829 in Sweden. Origin of name: named after "Thor", the mythological Scandinavian god of war. -------------------------------------------------
Table: basic information about and classifications of vanadium. | * Name: Vanadium * Symbol: V * Atomic number: 23 * Atomic weight: 50.9415 (1) * Standard state: solid at 298 K * CAS Registry ID: 7440-62-2 | * Group in periodic table: 5 * Group name: (none) * Period in periodic table: 4 * Block in periodic table: d-block * Colour: silvery grey metallic * Classification: Metallic |
Vanadium was discovered by Andres Manuel del Rio and Nils Sefström at 1801 in Mexico and Sweden. Origin of name: named after "Vanadis", the goddess of beauty in Scandinavian mythology. -------------------------------------------------
Table: basic information about and classifications of niobium. | * Name: Niobium * Symbol: Nb * Atomic number: 41 * Atomic weight: 92.90638 (2) * Standard state: solid at 298 K * CAS Registry ID: 7440-03-1 | * Group in periodic table: 5 * Group name: (none) * Period in periodic table: 5 * Block in periodic table: d-block * Colour: grey metallic * Classification: Metallic |
Niobium was discovered by Charles Hatchett at 1801 in England. Origin of name: from the Greek word "Niobe" meaning "daughter of Tantalus" (tantalum is closely related to niobium in the periodic table). -------------------------------------------------
Table: basic information about and classifications of tantalum. | * Name: Tantalum * Symbol: Ta * Atomic number: 73 * Atomic weight: 180.94788 (2) * Standard state: solid at 298 K * CAS Registry ID: 7440-25-7 | * Group in periodic table: 5 * Group name: (none) * Period in periodic table: 6 * Block in periodic table: d-block * Colour: grey blue * Classification: Metallic |
Tantalum was discovered by Anders Ekeberg at 1802 in Sweden. Origin of name: from the Greek word "Tantalos" meaning "father of Niobe" (Greek mythology, (tantalum is closely related to niobium in the periodic table). -------------------------------------------------
Table: basic information about and classifications of dubnium. | * Name: Dubnium * Symbol: Db * Atomic number: 105 * Atomic weight: [ 268 ] * Standard state: presumably a solid at 298 K * CAS Registry ID: 53850-35-4 | * Group in periodic table: 5 * Group name: (none) * Period in periodic table: 7 * Block in periodic table: d-block * Colour: unknown, but probably metallic and silvery white or grey in appearance * Classification: Metallic |
Dubnium was discovered by Workers at the Nuclear Institute at Dubna, and the University of California, Berkeley, USA. at 1967 in USSR, United States. Origin of name: the origin of the name dubnium is the Joint Nuclear Institute at Dubna", an institute heavily involved in the search for heavy elements. -------------------------------------------------
Table: basic information about and classifications of praseodymium. | * Name: Praseodymium * Symbol: Pr * Atomic number: 59 * Atomic weight: 140.90765 (2) * Standard state: solid at 298 K * CAS Registry ID: 7440-10-0 | * Group in periodic table: * Group name: Lanthanoid * Period in periodic table: 6 (lanthanoid) * Block in periodic table: f-block * Colour: silvery white, yellowish tinge * Classification: Metallic |
Praseodymium was discovered by Carl F. Auer von Welsbach at 1885 in Austria.Origin of name: from the Greek words "prasios didymos" meaning "green twin". -------------------------------------------------
Table: basic information about and classifications of protactinium. | * Name: Protactinium * Symbol: Pa * Atomic number: 91 * Atomic weight: 231.03588 (2) * Standard state: solid at 298 K * CAS Registry ID: 7440-13-3 | * Group in periodic table: * Group name: Actinoid * Period in periodic table: 7 (actinoid) * Block in periodic table: f-block * Colour: silvery metallic * Classification: Metallic |
Protactinium was discovered by Otto Hahn, Lise Meitner, Frederick Soddy, John Cranston at 1913 in Germany, England.Origin of name: from the Greek word "protos" meaning "first". -------------------------------------------------
Table: basic information about and classifications of chromium. | * Name: Chromium * Symbol: Cr * Atomic number: 24 * Atomic weight: 51.9961 (6) * Standard state: solid at 298 K * CAS Registry ID: 7440-47-3 | * Group in periodic table: 6 * Group name: (none) * Period in periodic table: 4 * Block in periodic table: d-block * Colour: silvery metallic * Classification: Metallic |
Chromium was discovered by Louis-Nicholas Vauquelin at 1797 in France.Origin of name: from the Greek word "chroma" meaning "colour", named for the many coloured compounds known for chromium.. -------------------------------------------------
Table: basic information about and classifications of molybdenum. | * Name: Molybdenum * Symbol: Mo * Atomic number: 42 * Atomic weight: 95.96 (2) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7439-98-7 | * Group in periodic table: 6 * Group name: (none) * Period in periodic table: 5 * Block in periodic table: d-block * Colour: grey metallic * Classification: Metallic |
Molybdenum was discovered by Carl William Scheele at 1781 in Sweden. Origin of name: from the Greek word "molybdos" meaning "lead". -------------------------------------------------
Table: basic information about and classifications of tungsten. | * Name: Tungsten * Symbol: W * Atomic number: 74 * Atomic weight: 183.84 (1) * Standard state: solid at 298 K * CAS Registry ID: 7440-33-7 | * Group in periodic table: 6 * Group name: (none) * Period in periodic table: 6 * Block in periodic table: d-block * Colour: greyish white, lustrous * Classification: Metallic |
Tungsten was discovered by Fausto and Juan Jose de Elhuyar at 1783 in Spain.Origin of name: from the Swedish words "tung sten" meaning "heavy stone" (the origin of the symbol W is "wolfram ", named after the tungsten mineral wolframite). -------------------------------------------------
Table: basic information about and classifications of seaborgium. | * Name: Seaborgium * Symbol: Sg * Atomic number: 106 * Atomic weight: [ 271 ] * Standard state: presumably a solid at 298 K * CAS Registry ID: 54038-81-2 | * Group in periodic table: 6 * Group name: (none) * Period in periodic table: 7 * Block in periodic table: d-block * Colour: unknown, but probably metallic and silvery white or grey in appearance * Classification: Metallic |
Seaborgium was discovered by Albert Ghiorso and others at 1974 in The Lawrence Berkeley Laboratory in California and the Livermore National Laboratory, USA.. Origin of name: glenn T. "Seaborg", American nuclear chemist and Nobel prize winner. -------------------------------------------------
Table: basic information about and classifications of neodymium. | * Name: Neodymium * Symbol: Nd * Atomic number: 60 * Atomic weight: 144.242 (3) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7440-00-8 | * Group in periodic table: * Group name: Lanthanoid * Period in periodic table: 6 (lanthanoid) * Block in periodic table: f-block * Colour: silvery white, yellowish tinge * Classification: Metallic |
Neodymium was discovered by Carl F. Auer von Welsbach at 1885 in Austria.Origin of name: from the Greek words "neos didymos" meaning "new twin". -------------------------------------------------
Table: basic information about and classifications of uranium. | * Name: Uranium * Symbol: U * Atomic number: 92 * Atomic weight: 238.02891 (3) [see notes g m * Standard state: solid at 298 K * CAS Registry ID: 7440-61-1 | * Group in periodic table: * Group name: Actinoid * Period in periodic table: 7 (actinoid) * Block in periodic table: f-block * Colour: metallic grey * Classification: Metallic |
Uranium was discovered by Martin Klaproth at 1789 in Germany. Origin of name: named after "the planet Uranus". -------------------------------------------------
Table: basic information about and classifications of manganese. | * Name: Manganese * Symbol: Mn * Atomic number: 25 * Atomic weight: 54.938045 (5) * Standard state: solid at 298 K * CAS Registry ID: 7439-96-5 | * Group in periodic table: 7 * Group name: (none) * Period in periodic table: 4 * Block in periodic table: d-block * Colour: silvery metallic * Classification: Metallic |
Manganese was discovered by Johann Gahn at 1774 in Sweden. Origin of name: from the Latin word "magnes" meaning "magnet", or "magnesia nigri" meaning "black magnesia" (MnO2). -------------------------------------------------
Table: basic information about and classifications of technetium. | * Name: Technetium * Symbol: Tc * Atomic number: 43 * Atomic weight: [ 98 ] * Standard state: solid at 298 K * CAS Registry ID: 7440-26-8 | * Group in periodic table: 7 * Group name: (none) * Period in periodic table: 5 * Block in periodic table: d-block * Colour: silvery grey metallic * Classification: Metallic |
Technetium was discovered by Carlo Perrier, Emilio Segre at 1937 in Italy. Origin of name: from the Greek word "technikos" meaning "artificial". -------------------------------------------------
Table: basic information about and classifications of rhenium. | * Name: Rhenium * Symbol: Re * Atomic number: 75 * Atomic weight: 186.207 (1) * Standard state: solid at 298 K * CAS Registry ID: 7440-15-5 | * Group in periodic table: 7 * Group name: (none) * Period in periodic table: 6 * Block in periodic table: d-block * Colour: greyish white * Classification: Metallic |
Rhenium was discovered by Walter Noddack, Ida Tacke, Otto Berg at 1925 in Germany. Origin of name: from the Greek word "Rhenus" meaning river "Rhine". -------------------------------------------------
Table: basic information about and classifications of bohrium. | * Name: Bohrium * Symbol: Bh * Atomic number: 107 * Atomic weight: [ 272 ] * Standard state: presumably a solid at 298 K * CAS Registry ID: 54037-14-8 | * Group in periodic table: 7 * Group name: (none) * Period in periodic table: 7 * Block in periodic table: d-block * Colour: unknown, but probably metallic and silvery white or grey in appearance * Classification: Metallic |
Bohrium was discovered by Peter Armbruster, Gottfried Münzenber and their co-workers. at 1981 in Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany.. Origin of name: the origin of the name is Niels "Bohr", the Danish physicist.. -------------------------------------------------
Table: basic information about and classifications of promethium. | * Name: Promethium * Symbol: Pm * Atomic number: 61 * Atomic weight: [ 145 ] * Standard state: solid at 298 K * CAS Registry ID: 7440-12-2 | * Group in periodic table: * Group name: Lanthanoid * Period in periodic table: 6 (lanthanoid) * Block in periodic table: f-block * Colour: metallic * Classification: Metallic |
Promethium was discovered by J. A. Marinsky, Lawrence Glendenin, Charles D. Coryell at 1945 in United States. Origin of name: named after "Prometheus" in Greek mythology, who stole fire from the gods. -------------------------------------------------
Table: basic information about and classifications of neptunium. | * Name: Neptunium * Symbol: Np * Atomic number: 93 * Atomic weight: [ 237 ] * Standard state: solid at 298 K * CAS Registry ID: 7439-99-8 | * Group in periodic table: * Group name: Actinoid * Period in periodic table: 7 (actinoid) * Block in periodic table: f-block * Colour: silvery metallic * Classification: Metallic |
Neptunium was discovered by Edwin M. McMillan and P. H. Abelson at 1940 in USA. Origin of name: named after "the planet Neptune". -------------------------------------------------
Table: basic information about and classifications of iron. | * Name: Iron * Symbol: Fe * Atomic number: 26 * Atomic weight: 55.845 (2) * Standard state: solid at 298 K * CAS Registry ID: 7439-89-6 | * Group in periodic table: 8 * Group name: (none) * Period in periodic table: 4 * Block in periodic table: d-block * Colour: lustrous, metallic, greyish tinge * Classification: Metallic |
Iron was discovered by Known since ancient times at no data in not known.Origin of name: from the Anglo-Saxon word "iron" or "iren" (the origin of the symbol Fe comes from the Latin word "ferrum" meaning "iron"). Possibly the word iron is derived from earlier words meaning "holy metal" because it was used to make the swords used in the Crusades.. -------------------------------------------------
Table: basic information about and classifications of ruthenium. | * Name: Ruthenium * Symbol: Ru * Atomic number: 44 * Atomic weight: 101.07 (2) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7440-18-8 | * Group in periodic table: 8 * Group name: Precious metal or Platinum group metal * Period in periodic table: 5 * Block in periodic table: d-block * Colour: silvery white metallic * Classification: Metallic |
Ruthenium was discovered by Karl Karlovich Klaus at 1844 in Russia. Origin of name: from the Latin word "Ruthenia" meaning "Russia". -------------------------------------------------
Table: basic information about and classifications of osmium. | * Name: Osmium * Symbol: Os * Atomic number: 76 * Atomic weight: 190.23 (3) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7440-04-2 | * Group in periodic table: 8 * Group name: Precious metal or Platinum group metal * Period in periodic table: 6 * Block in periodic table: d-block * Colour: bluish grey * Classification: Metallic |
Osmium was discovered by Smithson Tennant at 1803 in England. Origin of name: from the Greek word "osme" meaning "smell". -------------------------------------------------
Table: basic information about and classifications of hassium. | * Name: Hassium * Symbol: Hs * Atomic number: 108 * Atomic weight: [ 277 ] (status unclear) * Standard state: presumably a solid at 298 K * CAS Registry ID: 54037-57-9 | * Group in periodic table: 8 * Group name: (none) * Period in periodic table: 7 * Block in periodic table: d-block * Colour: unknown, but probably metallic and silvery white or grey in appearance * Classification: Metallic |
Hassium was discovered by Peter Armbruster, Gottfried Münzenber and their co-workers. at 1984 in Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany.. Origin of name: the origin of the name is the Latin word "Hassias" meaning "Hess", the German state. -------------------------------------------------
Table: basic information about and classifications of samarium. | * Name: Samarium * Symbol: Sm * Atomic number: 62 * Atomic weight: 150.36 (2) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7440-19-9 | * Group in periodic table: * Group name: Lanthanoid * Period in periodic table: 6 (lanthanoid) * Block in periodic table: f-block * Colour: silvery white * Classification: Metallic |
Samarium was discovered by Paul Emile Lecoq de Boisbaudran at 1879 in France.Origin of name: named after "Samarskite" (a mineral). -------------------------------------------------
Table: basic information about and classifications of plutonium. | * Name: Plutonium * Symbol: Pu * Atomic number: 94 * Atomic weight: [ 244 ] * Standard state: solid at 298 K * CAS Registry ID: 7440-07-5 | * Group in periodic table: * Group name: Actinoid * Period in periodic table: 7 (actinoid) * Block in periodic table: f-block * Colour: silvery white * Classification: Metallic |
Plutonium was discovered by Glenn T. Seaborg , J. W. Kennedy, E. M. McMillan, A. C. Wahl at 1940 in USA. Origin of name: named after "the planet Pluto". -------------------------------------------------
Table: basic information about and classifications of cobalt. | * Name: Cobalt * Symbol: Co * Atomic number: 27 * Atomic weight: 58.933195 (5) * Standard state: solid at 298 K * CAS Registry ID: 7440-48-4 | * Group in periodic table: 9 * Group name: (none) * Period in periodic table: 4 * Block in periodic table: d-block * Colour: lustrous, metallic, greyish tinge * Classification: Metallic |
Cobalt was discovered by Georg Brandt at 1735 in Sweden. Origin of name: from the German word "kobald" meaning "goblin" or evil spirit. -------------------------------------------------
Table: basic information about and classifications of rhodium. | * Name: Rhodium * Symbol: Rh * Atomic number: 45 * Atomic weight: 102.90550 (2) * Standard state: solid at 298 K * CAS Registry ID: 7440-16-6 | * Group in periodic table: 9 * Group name: Precious metal or Platinum group metal * Period in periodic table: 5 * Block in periodic table: d-block * Colour: silvery white metallic * Classification: Metallic |
Rhodium was discovered by William Hyde Wollaston at 1803 in England. Origin of name: from the Greek word "rhodon" meaning "rose". -------------------------------------------------
Table: basic information about and classifications of iridium. | * Name: Iridium * Symbol: Ir * Atomic number: 77 * Atomic weight: 192.217 (3) * Standard state: solid at 298 K * CAS Registry ID: 7439-88-5 | * Group in periodic table: 9 * Group name: Precious metal or Platinum group metal * Period in periodic table: 6 * Block in periodic table: d-block * Colour: silvery white * Classification: Metallic |
Iridium was discovered by Smithson Tennant, Antoine Fourcroy, Louis Vanquelin, Hippolyte Collet-Descotils at 1803 in England, France. Origin of name: from the Greek word "iris" meaning "rainbow". -------------------------------------------------
Table: basic information about and classifications of meitnerium. | * Name: Meitnerium * Symbol: Mt * Atomic number: 109 * Atomic weight: [ 276 ] * Standard state: presumably a solid at 298 K * CAS Registry ID: 54038-01-6 | * Group in periodic table: 9 * Group name: (none) * Period in periodic table: 7 * Block in periodic table: d-block * Colour: unknown, but probably metallic and silvery white or grey in appearance * Classification: Metallic |
Meitnerium was discovered by Peter Armbruster, Gottfried Münzenber and their co-workers. at 1982 in Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany.. Origin of name: named after Lise "Meitner", the Austrian physicist. -------------------------------------------------
Table: basic information about and classifications of europium. | * Name: Europium * Symbol: Eu * Atomic number: 63 * Atomic weight: 151.964 (1) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7440-53-1 | * Group in periodic table: * Group name: Lanthanoid * Period in periodic table: 6 (lanthanoid) * Block in periodic table: f-block * Colour: silvery white * Classification: Metallic |
Europium was discovered by Eugene Demarcay at 1901 in France. Origin of name: named after "Europe". -------------------------------------------------
Table: basic information about and classifications of americium. | * Name: Americium * Symbol: Am * Atomic number: 95 * Atomic weight: [ 243 ] * Standard state: solid at 298 K * CAS Registry ID: 7440-35-9 | * Group in periodic table: * Group name: Actinoid * Period in periodic table: 7 (actinoid) * Block in periodic table: f-block * Colour: silvery white * Classification: Metallic |
Americium was discovered by Glenn Seaborg, Ralph James., L. Morgan, Albert Ghiorso at 1944 in USA. Origin of name: from the English word "America". -------------------------------------------------
Table: basic information about and classifications of nickel. | * Name: Nickel * Symbol: Ni * Atomic number: 28 * Atomic weight: 58.6934 (4) * Standard state: solid at 298 K * CAS Registry ID: 7440-02-0 | * Group in periodic table: 10 * Group name: (none) * Period in periodic table: 4 * Block in periodic table: d-block * Colour: lustrous, metallic, silvery tinge * Classification: Metallic |
Nickel was discovered by Axel Fredrik Cronstedt at 1751 in Sweden. Origin of name: from the German word "kupfernickel" meaning Devil's copper or St Nicholas's (OLd Nick's) copper. -------------------------------------------------
Table: basic information about and classifications of palladium. | * Name: Palladium * Symbol: Pd * Atomic number: 46 * Atomic weight: 106.42 (1) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7440-05-3 | * Group in periodic table: 10 * Group name: Precious metal or Platinum group metal * Period in periodic table: 5 * Block in periodic table: d-block * Colour: silvery white metallic * Classification: Metallic |
Palladium was discovered by William Hyde Wollaston at 1803 in England. Origin of name: named after the asteroid "Pallas" which was discovered at about the same time and from the Greek name "Pallas", goddess of wisdom.

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Table: basic information about and classifications of platinum. | * Name: Platinum * Symbol: Pt * Atomic number: 78 * Atomic weight: 195.084 (9) * Standard state: solid at 298 K * CAS Registry ID: 7440-06-4 | * Group in periodic table: 10 * Group name: Precious metal or platinum group metal * Period in periodic table: 6 * Block in periodic table: d-block * Colour: greyish white * Classification: Metallic |
Platinum was discovered by Antonio de Ulloa at 1735 in South America. Origin of name: from the Spanish word "platina" meaning "silver". -------------------------------------------------
Table: basic information about and classifications of darmstadtium. | * Name: Darmstadtium * Symbol: Ds * Atomic number: 110 * Atomic weight: [ 281 ] * Standard state: presumably a solid at 298 K * CAS Registry ID: 54083-77-1 | * Group in periodic table: 10 * Group name: (none) * Period in periodic table: 7 * Block in periodic table: d-block * Colour: unknown, but probably metallic and silvery white or grey in appearance * Classification: Metallic |
Darmstadtium was discovered by S. Hofmann, V. Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg, H. J. Schött, and others at 1994 in Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany.. Origin of name: the name darmstadtium lies within the long established tradition of naming an element after the place of its discovery, Darmstadt, in Germany.. -------------------------------------------------
Table: basic information about and classifications of gadolinium. | * Name: Gadolinium * Symbol: Gd * Atomic number: 64 * Atomic weight: 157.25 (3) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7440-54-2 | * Group in periodic table: * Group name: Lanthanoid * Period in periodic table: 6 (lanthanoid) * Block in periodic table: f-block * Colour: silvery white * Classification: Metallic |
Gadolinium was discovered by Jean de Marignac at 1880 in Switzerland. Origin of name: named after J. "Gadolin", a Finnish chemist and minerologist. -------------------------------------------------
Table: basic information about and classifications of curium. | * Name: Curium * Symbol: Cm * Atomic number: 96 * Atomic weight: [ 247 ] * Standard state: solid at 298 K * CAS Registry ID: 7440-51-9 | * Group in periodic table: * Group name: Actinoid * Period in periodic table: 7 (actinoid) * Block in periodic table: f-block * Colour: silver * Classification: Metallic |
Curium was discovered by Glenn T. Seaborg, Ralph A. James, Albert Ghiorso at 1944 in USA. Origin of name: named after Pierre and Marie "Curie". -------------------------------------------------
Table: basic information about and classifications of copper. | * Name: Copper * Symbol: Cu * Atomic number: 29 * Atomic weight: 63.546 (3) [see note r] * Standard state: solid at 298 K * CAS Registry ID: 7440-50-8 | * Group in periodic table: 11 * Group name: Coinage metal * Period in periodic table: 4 * Block in periodic table: d-block * Colour: copper, metallic * Classification: Metallic |
Copper was discovered by Known since ancient times at no data in not known.Origin of name: from the Latin word "cuprum" meaning the island of "Cyprus". -------------------------------------------------
Table: basic information about and classifications of silver. | * Name: Silver * Symbol: Ag * Atomic number: 47 * Atomic weight: 107.8682 (2) [see noteg] * Standard state: solid at 298 K * CAS Registry ID: 7440-22-4 | * Group in periodic table: 11 * Group name: Coinage metal * Period in periodic table: 5 * Block in periodic table: d-block * Colour: silver * Classification: Metallic |
Silver was discovered by Known since ancient times at no data in not known.Origin of name: from the Anglo-Saxon word "siolfur" meaning "silver" (the origin of the symbol Ag comes from the Latin word "argentum" meaning "silver"). -------------------------------------------------
Table: basic information about and classifications of gold. | * Name: Gold * Symbol: Au * Atomic number: 79 * Atomic weight: 196.966569 (4) * Standard state: solid at 298 K * CAS Registry ID: 7440-57-5 | * Group in periodic table: 11 * Group name: Coinage metal * Period in periodic table: 6 * Block in periodic table: d-block * Colour: gold * Classification: Metallic |
Gold was discovered by Known since ancient times. at no data in not known.Origin of name: from the Anglo-Saxon word "gold" (the origin of the symbol Au is the Latin word "aurum" meaning "gold"). -------------------------------------------------
Table: basic information about and classifications of roentgenium. | * Name: Roentgenium * Symbol: Rg * Atomic number: 111 * Atomic weight: [ 280 ] * Standard state: presumably a solid at 298 K * CAS Registry ID: 54386-24-2 | * Group in periodic table: 11 * Group name: (none) * Period in periodic table: 7 * Block in periodic table: d-block * Colour: unknown, but probably metallic and silvery white or grey in appearance * Classification: Metallic |
Roentgenium was discovered by S. Hofmann, V. Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg, and others at 1994 in Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany.. Origin of name: the proposed name roentgenium has yet ot be accepted formally, but lies within the long established tradition of naming elements to honour famous scientists. Wilhelm Conrad Roentgen discovered X-rays in 1895. -------------------------------------------------
Table: basic information about and classifications of terbium. | * Name: Terbium * Symbol: Tb * Atomic number: 65 * Atomic weight: 158.92535 (2) * Standard state: solid at 298 K * CAS Registry ID: 7440-27-9 | * Group in periodic table: * Group name: Lanthanoid * Period in periodic table: 6 (lanthanoid) * Block in periodic table: f-block * Colour: silvery white * Classification: Metallic |
Terbium was discovered by Carl Mosander at 1843 in Sweden. Origin of name: named after "Ytterby", a town in Sweden. -------------------------------------------------
Table: basic information about and classifications of berkelium. | * Name: Berkelium * Symbol: Bk * Atomic number: 97 * Atomic weight: [ 247 ] * Standard state: solid at 298 K * CAS Registry ID: 7440-40-6 | * Group in periodic table: * Group name: Actinoid * Period in periodic table: 7 (actinoid) * Block in periodic table: f-block * Colour: unknown, but probably metallic and silvery white or grey in appearance * Classification: Metallic |
Berkelium was discovered by Glenn T. Seaborg, Stanley G. Thompson, Albert Ghiorso at 1949 in USA. Origin of name: named after "Berkeley", a city in California, home of the University of California, USA. -------------------------------------------------
Table: basic information about and classifications of zinc. | * Name: Zinc * Symbol: Zn * Atomic number: 30 * Atomic weight: 65.38 (2) [see note g] * Standard state: solid at 298 K * CAS Registry ID: 7440-66-6 | * Group in periodic table: 12 * Group name: (none) * Period in periodic table: 4 * Block in periodic table: d-block * Colour: bluish pale grey * Classification: Metallic |
Zinc was discovered by Andreas Marggraf at 1746 in Germany. Origin of name: from the German word "zink". -------------------------------------------------
Table: basic information about and classifications of cadmium. | * Name: Cadmium * Symbol: Cd * Atomic number: 48 * Atomic weight: 112.411 (8) [see noteg] * Standard state: solid at 298 K * CAS Registry ID: 7440-43-9 | * Group in periodic table: 12 * Group name: (none) * Period in periodic table: 5 * Block in periodic table: d-block * Colour: silvery grey metallic * Classification: Metallic |
Cadmium was discovered by Friedrich Strohmeyer at 1817 in Germany. Origin of name: somewhat confusingly, from the Latin word "cadmia" meaning "calamine" (zinc carbonate, ZnCO3) and from the Greek word "kadmeia" with the same meaning..