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| organizes information about the elements and their properties |
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| average mass of one atom of an element---protons + neutrons |
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| the number of protons in the nucleus of an atom---the number of protons identifies the element |
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| elements in the same column; have similar physical and chemical properties |
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| a material that can be pounded into shapes |
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| a material that can be pulled out, or drawn, into a long wire |
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Definition
| elements that can transmit heat and electricity easily |
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| attracted to magnets or can be made into magnets |
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| the process of reaction and wearing away |
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| a mixture of metals: brass is an alloy of copper and zinc |
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| elements that lack most of the properties of metals; located to the right of the zigzag line |
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| when molecules contain 2 atoms |
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Definition
| elements in Group 18; do not ordinarily form compounds with other elements |
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Term
| metalloid (semiconductor) |
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Definition
| elements that are on the zigzag line; have some characteristics of metals and some of nonmetals; semiconductors are substances that under some conditions can conduct electricity (like a metal) and other conditions cannot (like a nonmetal) |
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