Which of the following species is not isoelectronic with the others?

N a^{+}

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M g^{2 +}

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O^{2 -}

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C l^{-}

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Solution

The correct option is D $C l^{-}$
Isoelectronic species are those which have the same number of electrons.
Electrons in $N a^{+} = 10$
Electrons in $M g^{2 +} = 10$
Electrons in $O^{2 -} = 10$
Electrons in $C l^{-} = 18$
So, $C l^{-}$ ion is not isoelectronic with the other options.

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