Chemistry - f-block Question with Solution | TestHub

$1{\mathrm{s}}^{2}2{ \mathrm{s}}^{2}2{\mathrm{p}}^{6}3{ \mathrm{s}}^{2}3{\mathrm{p}}^{6}4{ \mathrm{s}}^{2}3{ \mathrm{d}}^{10}4{\mathrm{p}}^{6}5{ \mathrm{s}}^{2}4{ \mathrm{d}}^{10}5{\mathrm{p}}^{6}6{ \mathrm{s}}^2\boxed{4{\mathrm{f}}^{14}}5{ \mathrm{d}}^{10}6{\mathrm{p}}^{6}7{ \mathrm{s}}^2\boxed{5{\mathrm{f}}^4}6{\mathrm{d}}^1$

${}_{93} \mathrm{Np}=\left[{}_{86}\mathrm{Rn}\right]5f^{4}6{ \mathrm{d}}^{1}7{ \mathrm{s}}^2$

Total no. of electron in $\mathrm{f}$ subshell $=14$ in $4\mathrm{f}$ and $4$ in $5\mathrm{f}$ subshell $=18{\mathrm{e}}^{-}$