The mass number of an element is equal to the number of _____________ in the nucleus?
Correct answer: C. Neutrons plus protons (i.e., nucleons)
- A. Electrons
- B. Neutrons
- C. Neutrons plus protons (i.e., nucleons)
- D. Protons
Explanation
Mass number is the total number of nucleons in the nucleus, so it equals protons plus neutrons. Electrons are not included because they lie outside the nucleus and have negligible mass on this counting scale.
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