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A radioactive substance when emits one alpha particle (4/2 He), its mass number reduces by 4 and charge no. reduces by 2 and after emission of two β-particles its charge no. increases by 2 thus the charge no. i.e. atomic number remains the same.

1. Isotopes of an element have the same atomic number but different mass number.
2. A → Z+1Y : β, A → Z−1B : α
3. A−4B* → Z−1B : γ
4. Mass number and charge number of a nucleus remains unchanged during γ decay

Correct answer: Mass number and charge number of a nucleus remains unchanged during γ decay

Solution

During γ decay, the nucleus releases energy in the form of gamma radiation without any change in its mass number or atomic number, as no particles are emitted or absorbed.

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