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7 June, 05:46

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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  1. 7 June, 06:00
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    B number of protons
  2. 7 June, 09:31
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    number of protons in an atom's nucleus
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