Which of the following is the largest ion?

N a^{+}

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M g^{+ 2}

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O^{- 2}

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F^{-}

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Solution

The correct option is C $O^{- 2}$
$N a^{+}$ , $M g^{2 +}$ , $F^{-}$ and $O^{2 -}$ have 10 electrons each. In the case of isoelectronic species, the atom with the highest negative charge has the largest radius. Thus, $O^{2 -}$ has the largest radius.

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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) $N^{3 -}, C l^{-}$

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