How many maximum electrons can be described by the quantum numbers $n=5,l=2$ in a particular atom?

The maximum electrons can be described by the quantum numbers $n=5,l=2$ in a particular atom is 10 .

Here,

$n\mathit{=}5$

$l=2$

$m=(2\times 2)+1$

$(2l+1)=5$

maximum $e^{-}=5\times 2=10 {\mathrm{e}}^{-}$

$l=2$ means d-subshell which can accommodate maximum 10 electrons.

Hence, the option C is correct.