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(A) Let the mass number and atomic number of $X$ be $A$ and $Z_{num}$ respectively.$X(A, Z_{num}) \xrightarrow{-\alpha} Y(A-4, Z_{num}-2)$$Y(A-4, Z_{n

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$X$ and $W$

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(A) Let the mass number and atomic number of $X$ be $A$ and $Z_{num}$ respectively.$X(A, Z_{num}) \xrightarrow{-\alpha} Y(A-4, Z_{num}-2)$$Y(A-4, Z_{num}-2) \xrightarrow{-\beta} Z(A-4, Z_{num}-1)$$Z(A-4, Z_{num}-1) \xrightarrow{-\beta} W(A-4, Z_{num})$Isotopes have the same atomic number but different mass numbers.Comparing $X(A, Z_{num})$ and $W(A-4, Z_{num})$,they have the same atomic number $Z_{num}$ but different mass numbers $A$ and $A-4$.Therefore,$X$ and $W$ are isotopes.

$X$ $\xrightarrow{-\alpha } Y$ $\xrightarrow{-\beta } Z$ $\xrightarrow{-\beta } W$
In the above sequence of reaction,the elements which are isotopes of each other are

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$X$ $\xrightarrow{-\alpha } Y$ $\xrightarrow{-\beta } Z$ $\xrightarrow{-\beta } W$In the above sequence of reaction,the elements which are isotopes of each other are