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(C) Isotones are atoms that have the same number of neutrons.For atom $X$: Mass number $(A_X) = 70$,Atomic number $(Z_X) = 34$.Number of neutrons $(n)

Vedclass · Accepted Answer

$36$

Vedclass · Answer

(C) Isotones are atoms that have the same number of neutrons.For atom $X$: Mass number $(A_X) = 70$,Atomic number $(Z_X) = 34$.Number of neutrons $(n) = A_X - Z_X = 70 - 34 = 36$.Since $X$ and $Y$ are isotones,atom $Y$ also has $36$ neutrons.For atom $Y$: Mass number $(A_Y) = 72$,Number of neutrons $(n) = 36$.Atomic number $(Z_Y) = A_Y - n = 72 - 36 = 36$.

Two atoms of elements $X$ and $Y$ are isotones of each other. Their mass numbers are $70$ and $72$ respectively. If the atomic number of $X$ is $34$,then the atomic number of $Y$ is ..........

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