The mass number of an atom is the total number of _______ in its nucleus.

Name: The mass number of an atom is the total number of _______ in its nucleus.
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Question

Quizplus · Accepted Answer

Mass number is the sum of protons and neutrons in the nucleus. Electrons are not included because they have negligible mass compared to protons and neutrons. Charges are also not included as they can be positive or negative depending on the number of protons and electrons.

The Mass Number of an Atom Is the Total Number