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(D) The quantum numbers $n=3$ and $\ell=2$ correspond to the $3d$ subshell. Since the last electron is filled in the $3d$ subshell,we look for the max

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$30$

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(D) The quantum numbers $n=3$ and $\ell=2$ correspond to the $3d$ subshell. Since the last electron is filled in the $3d$ subshell,we look for the maximum number of electrons possible when the $3d$ subshell is completely filled. The electronic configuration for a completely filled $3d$ subshell is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10}$. Counting the total number of electrons: $2+2+6+2+6+2+10 = 30$. This corresponds to the element Zinc $(Zn)$ with atomic number $30$.

Column-$I$	Column-$II$
$A$. The orbital which has two angular nodes	$P$. $4d_{x^2-y^2}$
$B$. The $d$ orbital with zero nodal plane	$Q$. $3d_{z^2}$
$C$. The orbital with two radial nodes	$R$. $4f$
$D$. The orbital with three angular nodes	$S$. $3s$

The maximum number of electrons in an atom in which the last electron filled has the quantum numbers $n=3, \ell=2$ and $m=-1$ is

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