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The periodic Table

QuestionAnswer
John Newlands British Chemist 1863 proposed "law of Octaves"- properties of elements repeated by sets of 8.
Dmitri Mendeleev "Father of modern periodic table" 1834-1907 Russian Chemist worked for Russian Weights & Measures Also worked on the liquefaction of gases & on a theory of solutions.
Henry Moseley 1887-1915 1913, Henry Moseley rearranged the periodic table by the atomic numbers. Atomic Number= # of protons (P+)
Glenn Seaborg American Scientist 1940 Discovered Plutonium Discovered all the transoceanic elements from 94-102 Reconfigured the periodic table with the actinide series and lanthanide series below table. 1951 Noble prize.
Metals located on the left side. Good electrical and heat conductors. Malleable -can be beaten into thin sheets Ductile-Can be stretched into wire. Possess metallic luster(shiney). solid at room temp(except Hg) high melting point.
Non metals Located on the right side. Dull gas or solid at room temp brittle poor heat conductor insulators.
Metalloids Properties of both metals & nonmetals located along the stair step line
Periodic trend Is a regular variation (pattern) in the properties of an element related to increasing atomic number. periodic trends are important because they allow us to quickly predict an element's properties and how it will react to other elements.
Chemical Reactivity Is how likely an element is to react, or bond with other elements.
Atomic Radius (Radii) Atomic radius tells us how big an atom is.
Ionization Energy Is the energy needed to remove and electron from an atom the gaseous phase.
Atomic Mass It is approximately equivalent to the # of protons and # of neutrons added together. The average atomic mass on the periodic table however, is the average number allowing for the relative abundances of different isotopes.
Eletronegativity The measure of the ability of an atom in a chemical compound
Created by: MSavannahH13
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