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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 observationd that have been supported by testing |
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| the negatively charged particles found in all atoms; electrons are involved in the formation of chemical bonds. |
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| a representaion of and object or system |
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| the tiny, extremely dense, positively charged region in the center of an atom; made up of protons and nuetrons. |
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| the regions inside an atom where electrons are likely to be found. |
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| the weighted average of the masses of all the naturally recurring isotopes of an element. |
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| the sum of the protons and nuetrons in an atom. |
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| the positively charged particles of the nucleus; the number of protons in a nucleus is the atomic number that determines the identity of an element. |
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| the SI unit used to express the masses of particles in 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 have different nubers of nuetrons. |
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