Which of the following ions has 18 electrons | vedclass

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Question

(A) To determine the number of electrons in the outermost shell,we write the electronic configuration of each ion:$1$. $Cu^{+}$ $(Z=29)$: The configur

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$Cu^{+}$

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(A) To determine the number of electrons in the outermost shell,we write the electronic configuration of each ion:$1$. $Cu^{+}$ $(Z=29)$: The configuration is $[Ar] 3d^{10}$. The outermost shell is the $3rd$ shell,which contains $18$ electrons ($3s^2 3p^6 3d^{10} = 18$ electrons).$2$. $K^{+}$ $(Z=19)$: The configuration is $[Ne] 3s^2 3p^6$. The outermost shell is the $3rd$ shell,which contains $8$ electrons.$3$. $Cs^{+}$ $(Z=55)$: The configuration is $[Xe] 6s^0$. The outermost shell is the $5th$ shell,which contains $18$ electrons ($5s^2 5p^6 5d^{10} = 18$ electrons).$4$. $Cl^{-}$ $(Z=17)$: The configuration is $[Ne] 3s^2 3p^6$. The outermost shell is the $3rd$ shell,which contains $8$ electrons.Both $Cu^{+}$ and $Cs^{+}$ satisfy the condition of having $18$ electrons in the outermost shell. However,in the context of standard chemistry problems,$Cu^{+}$ is the most common answer for this specific configuration.

Which of the following ions has $18$ electrons in its outermost shell?

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