# The correct sequence of the ionic radii of the following is

$(a)\;I^- > S^{2-} > Cl^- > O^{2-} > F^{-} \\(b)\;S^{2-} > I^{-} > O^{2-} > Cl^{-} > F^{-} \\ (c)\;I^- > Cl^{-} > S^{2-} > O^{2-} > F^{-} \\ (d)\;I^- > S^{2-} > Cl^- > F^{-} > O^{2-}$

The sequence of the ionic radii is : $I^- > S^{2-} > Cl^- > O^{2-} > F^{-}$
Hence a is the correct answer.