Which of the following is not isoelectronic series.

C l^{-}, P^{3 -}, A r

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N^{3 -}, N e, M g^{+ 2}

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B^{+ 3}, H e, L i^{+}

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N^{3 -}, S^{2 -}, C l^{-}

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Solution

The correct option is A $N^{3 -}, S^{2 -}, C l^{-}$
$N^{3 -}, S^{2 -}, C l^{-}$ are not isoelectronic species as they contain different number of electrons.
$N^{3 -}, S^{2 -}, C l^{-}$ contain 10, 18 and 18 electrons respectively.

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