1.

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

Answer»

9
14
5
7

Solution :`""_(5)^(14)X to ""_(7)^(14)N + 2 ""_(1)^(0)beta`
NUMBER of NEUTRONS in `X = 14-5 = 9`.


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