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| the smallest particle into which an element can be divided and still be the same substance |
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| a unifying explanation for a broad range of hypotheses and observatios that have been supported by testing. |
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| the negitively charged particles found in all atoms. |
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| a representation of an object or system |
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| "the tiny, extremely dense, positively charged region in the center of an atom." |
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| regions inside an atom where electrons are likely to be found |
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Definition
| the positively charged particles of the nucleus |
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| the SI unit used to measure the masses of particlesin atoms |
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| the particles of the nucleus that have no charge |
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| the number of protons in the nucleus of an atom |
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| atoms that have the same number of protons but different numbers of neutrons |
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| the sum of the protons and neutrons in an atom |
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Definition
| the weighted average of the masses of all the naturally occuring isotopes of an element |
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