Which of the following group represent isoelectronic species?

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

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

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

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C a^{+ 2}, C s^{+}, N a^{+}

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Solution

The correct option is A $N^{- 3}, O^{- 2}, F^{-}$
$N^{3 -} = 10 e^{-}, O^{2 -} = 10 e^{-}, F^{-} = 10 e^{-}$
So $N^{3 -}, O^{2 -} a n d F^{-}$ are isoelectronic species

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