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0.uus7oh 6. The potential energy of interaction between two ions in an ionic compound is given by U= 1389.4 kJ mo.Assuming that CaCl, is linear molecule of length 5.6 A, the potential energy for CaCh, molecule in kJ mollis The ionic radii of Cs and CF ions are 181 and 167 pm, respectively. The born exponents for the He, Ne, Lr/A 7. Ar, Kr and Xe configurations are 5,7,9, 10 and 12 respectively. Ifthe value 4 tE is 2.45x 10 Jm, ANe se the lattice energy (in kJ mol-l) of CsCl according to Born-Lande equation is A first arder rafas