Which ion is not isoelectronic with $O^{2 -}$ ?

N^{3 -}

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N a^{+}

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F^{-}

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T i^{+}

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Solution

The correct option is D $T i^{+}$
$O^{2 -}$ has 10 electrons.
Consider the options:-
A) $N^{3 -}$ has 10 electrons.
B) $N a^{+}$ has 10 electrons.
C) $F^{-}$ has 10 electrons.
D) $T i^{+}$ has 21 electrons.
Hence $T i^{+}$ is not isoelectronic with $O^{2 -}$ .

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