Q.
In the following nuclear rection,
$D \xrightarrow {\alpha} D _{1} \xrightarrow {\beta^{-}} D _{2} \xrightarrow {\alpha} D _{3} \xrightarrow {\gamma} D _{4}$
Mass number of D is $182$ and atomic number is $74 .$
Mass number and atomic number of $D _{4}$ respectively will be
Solution: