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Question

The mass number and atomic number of an element are not changed when it emits _______

A
α
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B
β+
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C
γ
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D
β
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Solution

The correct option is C γ
A gamma ray has no mass and no charge.
Emitting a gamma ray makes no difference to the mass number or the atomic number but will make the nucleus more stable.
Emission of alpha particle reduced the mass number by 4 and atomic number by 2.
Emission of beta positive decreases the atomic number by 1 but mass number remains same.
Emission of beta negative increases the atomic number by 1 but mass number remains same.

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