Nuclear basics: What does the mass number of a nucleus represent? Interpret the definition in terms of subatomic particles inside the nucleus. Choose the correct description.

Concept Mass number A = Z (protons) + N (neutrons). Electrons are not counted in A. Final Answer Total number of nucleons (protons + neutrons).

Difficulty: Easy

Correct Answer: Total number of nucleons (protons + neutrons)

Explanation:

Concept

Mass number A = Z (protons) + N (neutrons). Electrons are not counted in A.

Final Answer
Total number of nucleons (protons + neutrons).

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