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| the center of an atom which contains the protons and neutrons |
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| negatively charged particle; located in the space surrounding the nucleus |
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| pure substance that consists entirely of one type of atom |
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| one of several forms of a single element which contains the same # of protons but different # of neutrons |
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| substance formed by the chemical combination of 2 or more elements in definite proportions |
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| chemical formed when one or more electrons are transfered from one atom to another |
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| atom that has a (+) or (-) charge |
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| type of bond between atoms in which the electrons are shared |
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| smallest unit of most compounds that displays all the properties of that compound |
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| slight attraction that develops between oppositely charged regions of nearby molecules |
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| the # of protons in the nucleus of an element |
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| the weighted average of the masses of an elements isotopes |
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