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Asked in NEET (Oct.) 2020 · Q-value, decay and conservation laws
A γ-ray is a photon: it carries zero charge and zero rest mass.
Mass number counts nucleons, and no nucleon leaves the nucleus, so A is unchanged.
Atomic number counts protons, and no charge leaves the nucleus, so Z is unchanged.
γ emission only carries away excitation energy, taking the nucleus from an excited state to a lower one.
Both numbers therefore remain the same.
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