abdira1995 abdira1995

05-06-2017
Social Studies

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9. An element's atomic number is the A. mass of the atom. B. number of protons in an atom's nucleus. C. sum of the protons and neutrons in an atom. D. weight of the atom.

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edynwolf1 edynwolf1

05-06-2017

B number of protons

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aledawilson12 aledawilson12

12-06-2017

number of protons in an atom's nucleus

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