5. The number of protons in one atom of an element determines the atom’s _____________‚ and the number of electrons determines the ________________ of the element. 6. 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 number gives the “identity” of an element as well as its location on the periodic table. 7. No two different elements will have the ____________________. What is
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1. America’s first trained nurse. -LINDA A. J. RICHARDS 2. The first bird domesticated by man. -ROCK DOVES 3. What method of arranging elements into related groups was invented by dimitri Mendeleyev -PERIODIC ARRANGING 4. What’s short for "Light Amplification by Stimulated Emission of Radiation"? LASER 5. What ya‚ Sohaira M. COMP FNDis the only domesticated animal not mentioned in the bible? -CAT 6. What is the longest river in the world? -NILE RIVER 7. What’s
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Janelle C. Gajardo IV-1 Mrs.Dimacutac December 5‚ 2011 Elements in the Periodic Table Trivia l Actinium (Ac) - radioactive element found in uranium ores‚ used in equilibrium with its decay products as a source of alpha rays.The name originates from the Greek word ’aktinos’ meaning ray or beam. l Argon (Ar) - they don’t often interact with other elements. This caused early mappers of the periodic table‚ such as Dmitri Mendeleev‚ to think of them as proud and noble. l Carbon (C) - can
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2. Element X melts in boiling water‚ it fails to react with hydrochloric acid; and 1 cm3 of element X has a mass of 1.8 grams. Is element X a metal or non-metal? Give the reasons for your answer. Element X is most likely a typical non-metal. First of all‚ element X melts in boiling water; non-metals typically have low melting and boiling points. Furthermore‚ element X is unable to react with hydrochloric acid. This greatly indicates that element X is a non-metal as most non-metals fail to
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New Elements Describe why "new" elements (man-elements) are created‚ or why do we benefit in creating them? Elements are the building blocks of which all things are composed. The elements of Earth are made up of atoms. All atoms possess a nucleus of positively charged protons as wells and neutrons which are neutrally charged. Surrounding the nucleus is a low density area containing negatively charged electrons that are equal to the number of protons within the nucleus. The number of protons within
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Contributors of the Periodic Table of Elements The First International Congress of Chemists took place in September 1860 in Karlsruhe‚ Germany to review scientific matters that there was little agreement to. Following this congress led to the development of the periodic table of elements. Top contributors to the periodic table included Staislao Cannizzaro‚ Dmitri Mendeleev‚ Henry Gwyn-Jeffreys Moseley‚ John William Strutt‚ William Ramsay‚ Friedrich Ernst Dorn‚ and Glenn Seaborg. Stanislao Cannizzaro
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Scandium is an element on the periodic table. Its atomic number is 21. Its atomic symbol is Sc. It has a silvery white color. It is classified as a metallic. Its group on the periodic table is 3. Its atomic mass is 45. Its melting point is 1541 Celsius. Its boiling point is 2836 Celsius. Its atomic is 216 pm. These a really interesting element. Scandium was discovered in Scandinavia in 1878. It was discovered by a man named Nilson. There is two metals that scandium has that were only found in Scandinavia
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Ruthenium often called its symbol‚ Ru‚ which atomic number is 44 and the atomic mass is 101.07 u ± 0.02 u. This element is known to have 27 radioactive isotopes but 7 regular isotopes. Ruthenium is solid at room temperature and looks like a hard‚ silvery-white metal with a shiny surface ( See page 2 for picture. ).The 3 main types of subatomic particles are protons‚ neutrons‚ and electrons. To humans Ruthenium is highly toxic and carcinogenic‚ and shouldn’t be touched if came into contact with.
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The Element Niobium Atomic Number: 41 Atomic Weight: 92.90638 Melting Point: 2750 K (2477°C or 4491°F) Boiling Point: 5017 K (4744°C or 8571°F) Density: 8.57 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 5 Group Number: 5 Group Name: none What’s in a name? Named for the Greek mythological figure Niobe. Say what? Niobium is pronounced as ni-OH-bee-um. History
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Most elements have isotopes. For stable isotopes‚ an interesting plot arises when the number of neutrons is plotted versus the number of protons. Because the plot shows only the stable isotopes‚ this graph is often called the Nuclear Belt of Stability. The plot indicates that lighter nuclides (isotopes) are most stable when the neutron/proton ratio is 1/1. This is the case with any nucleus that has up to 20 protons. As the atomic number increases beyond 20‚ a different trend becomes apparent. In
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