The coordination number of cation and anion in CaF2 and CsCl are, respectively :

Answer the following in brief. Cesium chloride crystallizes in cubic unit cell with Cl– ions at the corners and a Cs ion in the centre of the cube. How many CsCl molecules are there in the unit cell? - Chemistry | Shaalaa.com

1. The potential energy, E, per Cs^ - Cl^- ion pair within the CsCl crystal depends on the interionic separation, r, expressed mathematically thus: E(r) = -e^2M/(4??0r) B/r^m, where, e = 1.6 x 10^-19 C, M = 1.763, ?0 = 8.85x10^-12 Fm^-1 B = 1.192 x 10^-104 Jm^3, or 7.442 x 10^-5 eV(mm)^3, and m = 9, . Find the equilibrium separation (requ), of the ions in the crystal and the ionic bonding energy that is the ionic cohesive energy. Next, generate the corresponding Energy-Separation plot for the