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15 Cards in this Set
- Front
- Back
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what defines the element
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proton
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number of protons in the nucleus is called what
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atomic number
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what is the symbol for atomic number
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Z
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a one or two letter abbreviation for the element that appears directly below its atomic number on the periodic table
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chemical symbol
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who came up w/ the periodic table
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Mendeleev
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what is the periodic law
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when elements are arranged in order of increasing relative mass, certain sets of properties recur periodically
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Mendeleev listed the elements on the periodic table according to what
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increasing atomic number
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Mendeleev's periodic law was based on what
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observation
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describe metals
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-good conductors of heat
-shiny =tend to lose electrons |
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describe nonmetals
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- solids at room temp.
-poor conductors of heat -tend to gain electrons |
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describe metalloids
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-also called semiconductors
-intermediate electrical conductivity can be changed & controlled |
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what is a family or column on the periodic table
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each column within the main group elements in the periodic table
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where are the noble gases located and describe their reactivness
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-group 8A
-chemically inert |
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where are the alkali metals located and describe their reactivness
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-group 1A
-very reactive |
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where are the alkaline earth metals located and describe their reactivness
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-group A2
-fairly reactive |
