A) 9
B) 14
C) 5
D) 7
Correct Answer: A
Solution :
Atomic number increases by one after the emission of one \[\beta \]-particle. Hence, the parent nucleus (which on two successive \[\beta \] -emission gave \[_{7}{{N}^{14}}\]) must be \[_{5}{{X}^{14}}\] Hence, number of neutrons in parent nucleus = 14 - 5 = 9You need to login to perform this action.
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