Which of the following set of ions represent s a collection of isoelectronic species ?

B a^{2 +}, S r^{2 +}, K^{+}, C a^{2 +}

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K^{+}, C l^{-}, C a^{2 +}, S c^{3 +}

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N^{3 -}, O^{2 -}, F^{-}, S^{2 -}

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L i^{+}, N a^{+}, M g^{2 +}, C a^{2 +}

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Solution

The correct option is B $K^{+}, C l^{-}, C a^{2 +}, S c^{3 +}$
Consider the number of electrons in each of the options carefully:-
A) $B a^{2 +} - 54, S r^{2 +} - 36, K^{+} - 18, C a^{2 +} - 18$
B) $K^{+} - 18, C l^{-} - 18, C a^{2 +} - 18, S c^{3 +} - 18$
C) $N^{3 -} - 10, O^{2 -} - 10, F^{-} - 10, S^{2 -} - 18$
D) $L i^{+} - 2, N a^{+} - 10, M g^{2 +} - 10, C a^{2 +} - 18$
Hence option B is the right answer.

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