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| 1860- Russian, heard of the standardized masses and now created the first periodic table based on similar properties |
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| when elements were placed in increasing atomic mass, similar chemical properties appeared at regular intervals (periodic); groups were created to place elements with similar properties together; predicted scandium, gallium, germanium |
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| 1911- was working with Rutherford; noticed a better pattern- instead of increasing mass, he increased protons |
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| an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column (group) |
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| doesn't have a p-sublevel so when the s-level is filled, it is stable like group 18 |
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| -block, groups 3-12; e- configuration: (n-1) d#ns^2; pure state: high luster and good conductors; less reactive than groups 1 and 2; some don't react at all- palladium, platinum, and gold |
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| group 2; e- configuration: ns^2; pure state: harder, denser, and stronger than group 1; too reactive to be found freely in nature |
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| groups 1 (alkali metals) and 2 (alkaline-earth metals); chemically reactive metals |
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rule that states that atoms tend to gain, lose or share electrons so thaot each atom has a full outermost energy level
typically 8 levels (octo) |
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| unreactive due to octet nature; discovered in 1894 by Lord Rayleigh and SIr William Ramsay- discovered Argon, followed by the others in group 18 |
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True or False:
the elements of group 1A in the periodic table are Halogens |
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| 1) is a property that changes predictably as you move across a period or down a group of periodic table |
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| Atomic radius increses moving down a group |
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