If the radius of \( \mathrm{Cl}^{-} \)ion is \( 181 \mathrm{pm} \), and the radius of \( \mathrm...

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If the radius of \( \mathrm{Cl}^{-} \)ion is \( 181 \mathrm{pm} \), and the radius of \( \mathrm{Na}^{+} \)ion is \( 101 \mathrm{pm} \) then the edge length of unit cell is:
(a) \( 282 \mathrm{pm} \)
(b) \( 285.71 \mathrm{pm} \)
(c) \( 512 \mathrm{pm} \)
(d) \( 564 \mathrm{pm} \)
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