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A solid compound $X Y$ has $\mathrm{NaCl}$ structure. If the radius of the cation is $100 \mathrm{pm}$, the radius of the anion ( $Y^{-}$) will be
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$241.5 \mathrm{pm}$
Radius ratio of $\mathrm{NaCl}$ like crystal $=\frac{r^{+}}{r^{-}}=0.414$ or $r^{-}=\frac{100}{0.414}=241.5 \mathrm{pm}$
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