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| An arrangement of elements in columns based on a set of properties that repeat from row to row. |
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| A row in a periodic table of elements. |
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| A column on the periodic table of elements. |
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| One-twelfth the mass og a carbon -12 atom. |
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| Elements that are good conductors of heat and electric current |
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| Elements that form a bridge between elements on the left and right sides of the periodic table |
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| elements that are poor conductors of heat and electricity |
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| elements with properties that fall between those of metals and nonmetals |
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| An electron that is in the highest occupied energy level for an element in that group |
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| elements in group 1A;they have a single valence electron and are highly reactive |
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| elements in group 2A; have 2 valence electrons; harder than metals in Group 1A |
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| elements in group 7A; each has 7 valence electrons; highly reactive nonmetals |
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| elements in group 8A; helium has 2 valence electrons and the others have 8 valence electrons; colorless, odorless, and extremely unreactive |
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