Which one of the following is the smallest in size?

$N a^{3 +}$

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$O^{2 -}$

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$F^{-}$

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$N a^{+}$

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Solution

The correct option is D
$N a^{+}$

Among isoelectronic species, the relation in size is cation < neutral < anion
Hence, $N a^{+}$ has smallest size.

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