Which of the following pairs represents isoelectronic ions?

N a^{+}, K^{+}

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K^{+}, M g^{2 +}

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M g^{2 +}, C a^{2 +}

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C a^{2 +}, S^{2 -}

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Solution

The correct option is A $C a^{2 +}, S^{2 -}$
Isoelectronic ions are ions that have the same number of electrons. Atomic no. of Ca is 20. $C a^{2 +}$ has lost two electrons Therefore it has 18 electrons. Atomic no. of S is 16. $S^{2 -}$ has gained two electrons. Therefore, it has 18 electrons. Hence, $C a^{2 +}$ and $S^{2 -}$ are isoelectronic ions.

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