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| anything that occupies space and has mass. |
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| fixed composition; cannot be further purified. |
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| uniform composite throughout. |
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| a combination of two or more pure substances. |
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| elements united in fixed ratios. |
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| cannot be subdivided by chemical or physical means. |
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| the smallest unit of an element that has all of the properties of an element. |
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| the sum of the number of protons plus neutrons in the nucleus of an atom. |
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| the number of protos in the nucleus of an atom. |
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| atoms with the same number of protons but a different number of neutrons. |
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| the weighted average of the masses in amu of the isotopes of an element found in nature. |
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| the outermost incomplete shell. |
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| an electron in the valence shell. |
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| atoms and ions are the most stable when they have EIGHT electrons in the valence shell. |
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| bond formed as a result of sharing aa pair of electrons. |
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