Chapter 9, Problem 79E

The CsCl structure is a simple cubic array of chloride ions with a cesium ion at the center of each cubic array (see Exercise 69). Given that the density of cesium chloride is 3.97 g/cm³, and assuming that the chloride and cesium ions touch along the body diagonal of the cubic unit cell, calculate the distance between the centers of adjacent Cs⁺ and Cl⁻ ions in the solid. Compare this value with the expected distance based on the sizes of the ions. The ionic radius of Cs⁺ is 169 pm, and the ionic radius of Cl⁻ is 181 pm.