Problem: The mass number of an isotope is A. The number of protons in the nucleus B. The number of neutrons in the nucleus C. The number of electrons in the nucleus D. The sum of the number of protons and neutrons in the nucleus E. The sum of the number of protons and electrons in the nucleus

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Problem Details

The mass number of an isotope is

A. The number of protons in the nucleus

B. The number of neutrons in the nucleus

C. The number of electrons in the nucleus

D. The sum of the number of protons and neutrons in the nucleus

E. The sum of the number of protons and electrons in the nucleus

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