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

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An artificial radioactive isotope gave `._(7)^(14)N` after two successive `beta-`particle emission. The number of neutrons in the parent nucleus must be
A. 9
B. 14
C. 5
D. 7
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Correct Answer - A
`._(x)X^(y) overset(2beta)rarr ._(7)N^(14)`
`._(x =7-2)X^(y =14) = ._(5)X^(14)`
Total no. of neutrons `= 14 - 5 = 9`
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