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Question

If a Calcium atom with atomic number 20 and mass number 41 undergoes a β− (beta minus) The value of Z is__ and A is___in the daughter nucleus.

A
21
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B
41
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C

A=22, Z=41

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D

A=21, Z=42

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Solution

The correct option is B 41Since in beta minus a neutron converts into a proton so the atomic number has to increase by 1. Will the mass number change?? Hmmm... Not exactly right. Now I have a neutron less but a proton more, so the mass number is gonna remain unchanged. This means the Z will be 21 and A will remain 41.

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