MCQ
An element $A$ decays into element $C$ by a two step process :
$\begin{aligned} & \mathrm{A} \rightarrow \mathrm{B}+2^{\mathrm{He}^4} \\ & \mathrm{~B} \rightarrow \mathrm{C}+2^{\mathrm{e}^{-}}\end{aligned}$
Then
$\begin{aligned} & \mathrm{A} \rightarrow \mathrm{B}+2^{\mathrm{He}^4} \\ & \mathrm{~B} \rightarrow \mathrm{C}+2^{\mathrm{e}^{-}}\end{aligned}$
Then
- ✓$A$ and $C$ are isotopes
- B$A$ and $C$ are isobars
- C$A$ and $B$ are isotopes
- D$A$ and $B$ are isobars
