Question

(2 pts) Arrange the following ionic compounds in order of increasing lattice energy. Provide a brief explanation for the order you have provided. a. CsBr, RbBr, Csl b. CaS, KCl, GaP 1.

Answer 1

A) CsI < CsBr < RbBr

Lattice energy is depend on charge and size of ions. As all have same charge. So higher the size , lesser the lattice energy. So Cs and I has higher size so less lattice energy.

B)KCl < CaS < GaP

Higher the charge, more the lattice energy so , KCl has only +1 ,-1 while CaS has +2 & -2 and GaP has +3 & -3 . So GaP has highest lattice energy