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| small particle that makes up most types of matter |
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| average mass of an atom of an element |
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| substance whose smallest unit is made up of atoms of more than one element bonded together |
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| invisible, negatively charged particle located in a cloudlike formation that surrounds the nucleus of an atom |
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| has unique properties and is generally classified as a metal, metalloid, or nonmetal |
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| 2 or more atoms of the same element that have different numbers of neutrons in their nuclei |
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| states that matter is not created or destroyed but only changes its form |
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| law of conservation of matter |
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| sum of the number of protons and neutrons in the nucleus of an atom |
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| anything that takes up space and has mass |
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| generally have a shiny luster and are good conductors of heat and electricity |
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| elements that have characteristics of metals and nonmetals |
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| when substances come together but don't combine to make a new substance |
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| an uncharged particle located in the nucleus or an atom |
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| elements usually dull in appearance |
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| positively charged, central part of an atom |
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| positively charged particles in the nucleus |
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| matter with a fixed composistion whose identity can be changed by a chemical process, but not by ordinary physical processes |
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