If the distance between \( \mathrm{Na}^{+} \)and \( \mathrm{Cl}^{-} \)ions in \( \mathrm{NaCl} \...
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2If the distance between \( \mathrm{Na}^{+} \)and \( \mathrm{Cl}^{-} \)ions in \( \mathrm{NaCl} \) crystal is \( a \mathrm{pm} \), the edge length of the unit cell is:
(A) \( 4 a \mathrm{pm} \)
(B) \( \frac{a}{4} \mathrm{pm} \)
(C) \( \frac{a}{2} \mathrm{pm} \)
(D) \( 2 a \mathrm{pm} \)
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