It is usually defined as the enthalpy of formation of the ionic compound from gaseous ions and as such is invariably exothermic, lattice energy may also be defined as the energy required to completely separate one mole of a solid ionic compound into gaseous ionic constituents.
It is usually defined as the enthalpy of formation of the ionic compound from gaseous ions. Lattice energy may also be defined as the energy. This energy is required to completely separate one mole of a solid ionic compound into gaseous ionic constituents. Such is invariably exothermic.