THE PERIODIC TABLE HISTORICAL BACKGROUND The idea that all things are elements or combinations of elements can be found in the writings of the ancient Greeks and other early peoples. Although this idea may seem simple‚ it is very difficult to decide if a substance is indeed an element or a compound. There were twelve chemical elements discovered in ancient times‚ but it was not known that they were elements. Another 76 elements were discovered between 1557 and 1925. Many mistakes were made in
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8 l SUFFIXES l l l The Suffixes are letters added to the end of words to make new words. (The suffixes change the word class of the words they attached to) - Common Noun Suffixes: 1. –er / -or: these suffixes are added to Verbs to derive nouns of a person who does the a action. Verbs + –er ــــــــــــــــــــــــ> noun of a person
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investigation was to find the average atomic mass for the element Beanium with three isotopes. The average atomic mass is the average mass of the atoms of the element divided by the total number of atoms. An isotope is an atom with the same number of protons‚ but different number of neutrons; they are different forms of a single element. Since we knew the isotopes had almost the same amount of sub-atomic particles‚ we made our hypothesis the following: If the sub-atomic particles are almost exact in amount
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Place of Birth: Many different countries Personality: (melting- 600.61 K --- 327.46 C --- 621.43 F) (Boiling- 2022 K --- 1749 C --- 3180 F) Page 2 Pronunciation Rebus: lēd/ Page 4 # of protons: 82 # of neutrons: 125 # of electrons: 82 Atomic number: 82 Page 6 Family Name: Carbon Family Address: 6 Ancient Drive Brother and Sister: Carbon‚ Silicon‚ Germanium‚ Tin. FleroviumProud Parents of Lead Page 1 Name of element: Kobe Lead Nickname of element: (Pb) Birth Date: Ancient Times
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periodic table in 1928. How the periodic table is organized: Charles Janet’s periodic table was organized according all elements that had been discovering before 1928 according to the orbital filling. It also structures the electrons in ascending atomic order Describe the information the periodic table contains: DISADVANTAGE: * The periodic table has a rough tarnation from metal to none-metal. DISADVANTAGE: * The periodic table has a rough tarnation from metal to none-metal. ADVANTAGES:
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atom. Atomic Notation Chemical symbols such as C for carbon‚ H for hydrogen‚ and Cs for cesium are used to identify each type of atom. The atomic number of the element is designated as Z and the mass number is designated as A. The atomic number is always equal to the number of protons in the atom. The mass number is equal to the sum of the number of protons and number of neutrons. The mass number (A) is always written as a superscript‚ as in 14C (carbon-14) or as C-14. The atomic number is written
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dewees (vd866) – Exam review – dewees – (24127) This print-out should have 35 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Elements can be distinguished by their 1. hardness. 2. transparency. 3. dissolves in carbon disulfide 4. density of 2.07 g/ml 005 10.0 points Which of these substances I) table salt II) the liquid called coffee III) mercury is a mixture? 3. brittleness. 1. II and III only 4. density. 2. All
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immediately after actinium. The general electronic configuration is [Rn]5f1-14 6d0-1 7s2 Lanthanides (58Ce- 71Lu) - This series starts from Lanthanum ( atomic numbe r= 57) and continues up to the Lu (Lutetium) as shown in table above. All the elements of the lanthanide series resemble to each other very closely due to the presence of same number of electrons in outermost and the penultimate shells. They are also called rare earth elements. Though Lanthanum is a d-block element but included
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Atomic Structure Worksheet Name: Period: 1. Name the three particles of the atom and their respective charges are: a. b. c. 2. The number of protons in one atom of an element determines the atom’s ‚ and the number of electrons determines of an element. 3. The atomic number tells you the number of in one atom of an element. It also tells you the number of in a neutral atom of that element. The atomic
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From the Old English word geolo (yellow) Symbol: Au Atomic Number: 79 Atomic Mass: 196.96655 amu Group/section: Gold is element number 79 found in group 11 period 6 Electron configuration: [Xe] 4f14 5d10 6s1 Valence electrons: 1 Physical or chemical properties: Color: gold Crystal Structure: Cubic Density at 293 K: 19.32 g/cm3 Melting Point: 1064.43 °C (1337.5801 K‚ 1947.9741 °F) Boiling Point: 2807.0 °C (3080.15 K‚ 5084.6 °F) Number of Neutrons: 118 Gold is both malleable and ductile
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