Question

Why the lattice energy of fluoride is greater than chloride

Answer 1

Answer. Lattice energy is a function of the radius ratio, which when tends to 1, improves the packing efficiency of the molecule. Here the radius ratio of the chloride ions and aluminium ions is much closer than the fluoride ions.

Answer 2

Answer:

Fluorine has lower electron affinitythan chlorine and yet it is a stronger oxidising agent than chlorine. i)when element combine withfluorine the energy released are highest due to small in size of F. ii)lattice energy and hydration energy of fluoride are higher those of chlorides.