In the gamma decay of a nucleus

the mass number of the nucleus changes whereas its atomic number does not change
the mass number of the nucleus does not change whereas its atomic number changes
both the mass number and the atomic number of the nucleus change
neither the mass number nor the atomic number of the nucleus changes

Correct Answer: neither the mass number nor the atomic number of the nucleus changes

Explanation:

The emission of gamma rays does not alter the number of protons or neutrons in the nucleus but instead has the effect of moving the nucleus from a higher to a lower energy state (unstable to stable)

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