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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

A=21, Z=41


Since 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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