If the edge-length of the unit cell of sodium chloride is 600 \( \mathrm{pm} \), and the ionic r...

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If the edge-length of the unit cell of sodium chloride is 600 \( \mathrm{pm} \), and the ionic radius of \( \mathrm{Cl}^{-} \)ion is \( 190 \mathrm{pm} \), then the ionic radius of \( \mathrm{Na}^{+} \)ion is
(a) \( 310 \mathrm{pm} \)
(b) \( 110 \mathrm{pm} \)
(c) \( 220 \mathrm{pm} \)
(d) None of these
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