The \( \mathrm{CsCl} \) type structure is exhibited by alkali halides only when the radius of th...

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The \( \mathrm{CsCl} \) type structure is exhibited by alkali halides only when the radius of the cation is large enough to keep touching its eight nearest neighbour anions. Below what minimum ratio of cation to anion radii \( \left(r^{+} / r^{-}\right) \)this contact is prevented?
(a) \( 0.225 \)
(b) \( 0.414 \)
(c) \( 0.632 \)
(d) \( 0.732 \)
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