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| mass and volume are two characteristics |
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| changes that alter the identity of a substance |
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| properties that can be observed without charging the identity of a substance |
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| substance made of 2 or more elements chemically bonded in a definite amount |
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| matter made by combining 2 or more substances but each substance reatains its own properties |
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| identity of an element is determined by the amount of blank in the nucleus. |
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| an ion is formed when an atom gains or loses blank |
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| atoms of the same element that have different numbers of neutrons |
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| the number on the periodic table that tells the number of grams |
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