The mass number of an atom is the sum of its
Aprotons and electrons
Bneutrons and electrons
Cprotons and neutronsCORRECT
Datomic number and electrons
JAMB UTMEChemistry
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Why the answer is C, and why the others tempt you.
Mass number A = Z (protons) + N (neutrons). Electrons are too light to count significantly.
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