In sodium chloride unit cell, there are four Na+ and four Cl- ions.Hence,density = mass of atoms in a unit cellvolume of a unit cell =M2a3NAEach unit cel of NaCl4 Na- and 4 Cl- 2 ions → Z= 4 = 4 (23 + 35.5) g mol-1(6.023× 1023 mol-1) ×( 564 ×10-12cm)3 = 2.165 g cm-3
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