Which of the following constitutes a group of isoelectronic species?

C O, N_{2}, O_{2}^{-}

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N_{2}, C N^{-}, N O^{+}

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O_{2}^{-}, N O, C_{2}^{2 -}

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

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

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Solution

The correct option is A $N_{2}, C N^{-}, N O^{+}$
Explanation for option B-
$N_{2} = 7 + 7 = 14$ electrons,
$C N^{- 1} = 6 + 8 = 14$ electrons,
$N O^{+ 1} = 7 + 7 = 14$ electrons,
Note- ( $+$ ) charge means loss of electrons and ( $-$ ) charge means gain of electrons.

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

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