MCQ
Highest energy will be absorbed to eject out the electron in the configuration
- A$1{s^2}2{s^2}2{p^1}$
- ✓$1{s^2}2{s^2}2{p^3}$
- C$1{s^2}2{s^2}2{p^2}$
- D$1{s^2}2{s^2}2{p^4}$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

$X$ and $Y$ respectively are :