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Question

If a 4120Ca atom undergoes a β emission, then the value of Z isand A isin the daughter nucleus.

A
21
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B
25
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C
42
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D
41
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Solution

The correct options are
A 21
D 41
While emitting a β - particle, the total number of nucleons in nucleus B remains the same but the number of neutrons is decreased by one and the number of protons is increased by one. Therefore, the Z of Ca will be increased by 1, while A will remain the same. The reaction is as follows:
4120Ca 4121Sc + 01e
Calcium, after the beta emission, forms scandium (Sc).

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