Question

In crystals of the salt cesium chloride, cesium ions Cs+ form the eight corners of a cube and a chlorine ion Cl- is at the cubes center. The edge length of the cube is L = 3.5 x 10^-10 m. The Cs+ ions are each deficient by one electron( and thus each has a charge of +e) and the Cl+ has one excess electron (and thus has a charge of -e). (a) if one of the Cs+ ions is missing the crystal is said to have a defect; with a reference potential at a point infinitely far away from the crystal, what is th net potential at the location of the missing Cs+ ion? (b) How much energy is required to assemble this crystal of seven Cs+ ions and a Cl- ion at the center?

Answer 1

The following figure shows the arrangment of cesium ions Cs+ and chlorine ion Cl- .