Which Ion Is NOT Isoelectronic (I $\begin{array} { |l | l| } \hline \mathrm { S } & 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 4 }\\\hline \end{array}$

question 12

Multiple Choice

Which ion is NOT isoelectronic (i.e.has the same electron configuration) with Ar? The electron configuration of Ar is shown. $\begin{array} { |l | l| } \hline \mathrm { S } & 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 4 }\\\hline \end{array}$

• A)Cl^?
• B)K⁺
• C)Br^?
• D)Ca²⁺
• E)S^2?

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