Chemistry - Atomic Structure Question with Solution | TestHub

$n$ represents the main energy level and $l$ represents the subshell. If $n=4$ and $l=3$, the subshell is $4f$. In $f$ subshell, there are 7 orbitals and each orbital can accommodate a maximum of two electrons, so, maximum number of electrons in 4 $\begin{array}{rl}4f\text{ subshell }& =7\times 2\\ & =14\end{array}$