Which of the following pairs is isoelectronic in nature?

C l^{-}, A r, K^{+}

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N e, F^{+}, O^{2 -}

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N^{3 -}, O^{2 -}, A r

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A r, N a^{+}, M g^{2 +}

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Solution

The correct option is A
$C l^{-}, A r, K^{+}$
Isoelectronic species are those species that have the same number of electrons.

a) $C l^{-}, A r, K^{+} (C l^{-} = 17 + 1, A r = 18, K^{+} = 19 - 1)$

b) $N e, F^{+}, O^{2 -} (N e = 10, F^{+} = 9 - 1, O^{2} - = 8 + 2)$

c) $N^{3 -}, O^{2 -}, A r (N^{3 -} = 7 + 3, O^{2 -} = 8 + 2, A r = 18)$

d) $A r, N a^{+}, M g^{2 +} (A r = 18, N a^{+} = 11 - 1, M g^{2 +} = 12 - 2)$

All the elements in a) have the same number of electrons ie., 18

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