Which of the following ion is isoelectronic with $O^{2 -}$ ?

N^{3 -}

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N^{+}

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F^{-}

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T i^{+ 3}

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Solution

The correct options are
A $N^{3 -}$
C $F^{-}$
Isoelectronic means species with same number of electrons.
$O^{2 -}$ has 10 electrons ( $8 + 2 = 10$ ).
$N^{3 -}$ has 10 electrons ( $7 + 3 = 10$ ).
So $O^{2 -}$ is isoelectronic with $N^{3 -}$ .
Hence option A is correct.

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o A

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