Which of the following sets of quantum numbers describes the electron occupying the highest energy o — Atomic Structure Chemistry Question

💡 Solution & Explanation

The energy of an orbital in a multi-electron atom is governed by the $(n+l)$ rule. Higher $(n+l)$ means higher energy. For A ($3p$), $n+l=4$. For B ($3d$), $n+l=5$. For C ($4s$), $n+l=4$. For D ($3s$), $n+l=3$. The $3d$ orbital has the highest $(n+l)$ value of $5$, making it the highest energy level among the choices.