Which of the following 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^{+ 3}

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Solution

The correct option is C $T i^{+ 3}$
Isoelectronic means having the same number of electrons.

Oxygen(II) anion has 10 electrons.

$N a^{+}$ has 10 electrons.

$F^{-}$ has 10 electrons.

Ti has atomic number 22 which is not isoelectronic with oxygen anion.

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O^{2 -}

N^{3 -}, O^{2 -}, F^{-}, {N a}^{+}, {M g}^{2 +}

Question 20

In which of the following pairs, the ions are isoelectronic ?

(a) $N a^{+}, M g^{2 +}$ (b) $A l^{3 +}, O^{-}$ (c) $N a^{+}, O^{2 -}$ (d) $N^{3 -}, C l^{-}$

^{2 -}

^{-}

^{-}

^{+}

^{3 +}

O^{2 -}, F^{-}, N a^{+}, M g^{2 +}

N a^{+}, M g^{+}, A l^{3 +}, F^{-}

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

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