An artifical radioactive isotope gave ""...

An artifical radioactive isotope gave `""_(7)^(14)N` after two successive `beta`-particle emissions. The number of neutrons in the parent nucleus must be

A

9

B

14

C

5

D

7

Verified by Experts

The correct Answer is:

A

`""_(x)X^y overset(2beta)to ""_(7)N^(14)`
`""_(x=7-2)X^(y=14) = ""_(5)X^(14)`
Total no. of neutrons = 14-5=9

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