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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 ma

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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 $30$.

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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