Number of neutrons i8n a parent nucleus ...

Number of neutrons i8n a parent nucleus `X`, which gives `._(7)^(14)N` after two sucessive `beta-` emission would be:

A

9

B

8

C

7

D

6

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The correct Answer is:

A

`""_(5)X^(14) overset(-2beta)to ""_(7)N^(14)` then no . Of neutrons in `""_(5)X^(14) = 14-5 = 9 `

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