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(B) The $3^{rd}$ principal energy level $(n=3)$ consists of $3s$,$3p$,and $3d$ subshells. For this level to be completely filled,it must contain $2 +

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$Cu, Zn$

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(B) The $3^{rd}$ principal energy level $(n=3)$ consists of $3s$,$3p$,and $3d$ subshells. For this level to be completely filled,it must contain $2 + 6 + 10 = 18$ electrons.In $Ar$ $(Z=18)$,the configuration is $1s^2 2s^2 2p^6 3s^2 3p^6$. Here,the $3d$ subshell is empty,so the $3^{rd}$ level is not completely filled.In $Zn$ $(Z=30)$,the configuration is $[Ar] 3d^{10} 4s^2$. The $3^{rd}$ level $(3s^2 3p^6 3d^{10})$ contains $18$ electrons and is completely filled.In $Cu$ $(Z=29)$,the configuration is $[Ar] 3d^{10} 4s^1$. The $3^{rd}$ level is completely filled.In $Cu^{+2}$ $(Z=29)$,the configuration is $[Ar] 3d^9$. The $3^{rd}$ level is not completely filled.In $Zn^{+2}$ $(Z=30)$,the configuration is $[Ar] 3d^{10}$. The $3^{rd}$ level is completely filled.Comparing the options,both $Cu$ and $Zn$ have a completely filled $3^{rd}$ principal energy level.

Which of the following sets of species has the $3^{rd}$ principal energy level $(n=3)$ completely filled?

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