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

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

User Bhuvanesh
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2 Answers

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An element's atomic number is C. number of protons in an atom's nucleus. 
User Mssm
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2 votes
C. Number of protons in an atom's nucleus
User Ostap Brehin
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