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(D) . $A$ nucleus $X$ captures a $\beta$-particle and then emits a neutron and $\gamma$-ray to form $Y$. The nuclear reaction is as follows:${}_{Z}X^{

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isotones

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(D) . $A$ nucleus $X$ captures a $\beta$-particle and then emits a neutron and $\gamma$-ray to form $Y$. The nuclear reaction is as follows:${}_{Z}X^{A} + {}_{-1}e^{0}$ $\rightarrow {}_{Z-1}X^{A}$ $\xrightarrow{-{}_{0}n^{1}} {}_{Z-1}Y^{A-1} + \gamma$Here,$A$ is the mass number of $X$ and $Z$ is the atomic number of $X$.Number of neutrons in $X = A - Z$.Number of neutrons in $Y = (A - 1) - (Z - 1) = A - Z$.Since both $X$ and $Y$ have the same number of neutrons,they are isotones.

$A$ nucleus $X$ captures a $\beta$-particle and then emits a neutron and $\gamma$-ray to form $Y$. $X$ and $Y$ are

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