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The mass number of an atom is determined by ___. 1.adding the protons and electrons 2.adding the protons and neutrons 3.adding the electrons and neutrons 4. adding the protons,electrons and neutrons
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The mass number of an atom is determined by ___.

1.adding the protons and electrons
2.adding the protons and neutrons
3.adding the electrons and neutrons
4. adding the protons,electrons and neutrons

User Anij
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1 Answer

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2: protons and neutrons
User Hamed Minaee
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