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Which one of the following is the smallest in size?

$\begin{array}{1 1}(a)\;N_3^-&(b)\; O_2^-\\(c)\;F^-&(d)\;Na^+\end{array}$

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A)
$Na^+$ is the smallest in size among the $N^{3-},F^-,O^{2-}$ and $Na^{+}$
Hence (d) is the correct answer.
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