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The triad of nuclei that is isotonic is...

The triad of nuclei that is isotonic is

A

`underset6C^14` , underset7N^(14) , underset 9F^(19)`

B

`underset6C^14` , underset7N^(15) , underset9F^(17)`

C

`underset7C^14` , underset7N^(14) , underset9F^(17)`

D

`underset6C^12` , underset7N^(14) , underset9F^(19)`

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The correct Answer is:
B
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