question_answer

Among the alkali metal halides, lattice enthalpy is maximum for LiF and least for \[CsI\].

Answer:

                Magnitude of lattice enthalpy is closely linked with inter nuclear distance. Smaller the distance more is the value of lattice enthalpy. The inter nuclear distance is expected to be least in LiF while maximum in \[CsI\]. Therefore, the former has the maximum lattice enthalpy while the latter has the minimum value.