\( \mathrm{KCl} \) crystallizes in the same type of lattice as does \( \mathrm{NaCl} \). Given t...

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\( \mathrm{KCl} \) crystallizes in the same type of lattice as does \( \mathrm{NaCl} \). Given that \( \mathrm{r}_{\mathrm{Na}^{+}} / \mathrm{r}_{\mathrm{Cl}^{-}}=0.50 \) and \( \mathrm{r}_{\mathrm{Na}^{+}} / \mathrm{r}_{\mathrm{K}^{+}}=0.70 \), calculate the ratio of the side of the unit cell for \( \mathrm{KCl} \) to that for \( \mathrm{NaCl} \) :
(a) 1.143
(b) 1.224
(c) 1.414
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