Question

Factors on which lattice energy depends and how it vary with these factors

Answer 1

Lattice energy is the energy required to break an ionic lattice into its constituents ions.
If a bond is stable then high amount of energy is required to break the bond. So, higher the lattice energy, higher will be the energy required to break the ionic bond between the constituent ions in a crystal lattice. Therefore, higher will be the stability of the ionic compound.
Factors on which lattice energy depends:
Ionic radii and the size of the ion and its charge affects the lattice energy given as under:
The lattice energies decreases,as the ionic radii of either the cation or anion increases.
The solids consists of divalent ions have much larger lattice energies than solids with mono valent ions.