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| a row of elements in the periodic table whose properties change gradually and predictably |
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| contains elements that have similar physical or chemical properties |
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| groups 1 and 2 and groups 13-18 of the periodic table which include metals, non-metals and metalloids |
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| groups 3-12 of the periodic table which are all metals |
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| an element that has good luster, is a good conductor of heat and electricity, is malleable, and is ductile |
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| 17 elements that are usually gases or brittle solids at room temperature and poor conductors of heat and electricity |
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| elements that share some properties with metals and with some nonmetals (also called semimetals) |
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| doesn't conduct electricity as well as metal but does conduct electricity better than nonmetals |
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| a substance that con make something happen faster but is not changed itself |
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| are made in labs and nuclear reactors |
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