In crystals of the salt cesium chloride, cesium ions Cs+ form the eight corners of a cube

In crystals of the salt cesium chloride, cesium ions Cs+ form the eight corners of a cube

In crystals of the salt cesium chloride, cesium ions Cs+ form the eight corners of a cube and a chlorine ion Clis at the cube”s center (Fig. 21-36). The edge length of thecube is 0.40 nm. The Cs⁺ ions are each deflcient by one electron (and thus each has a charge of +e), and the Clion  has one excess electron (and thus has a charge of – e). (a) What is the magnitude of the net electrostatic force exerted on the Cl^– ion by the eight Cs+ ions at the corners of the cube? (b) If one of the Cs⁺ ions is missing, the crystal is said to have a defect; what is the magnitude of the net electrostatic force exerted on the Cl^–ion by the seven remaining Cs⁺ ions?

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