Lattice energy applies to ionic compounds and is defined as the energy needed to completely separate one mole of a solid ionic compound into its gaseous ions. Often this cannot be accomplished directly and is why Max Born and Fritz Haber developed a method using Hesss law to allow calculation of lattice energies using ionization energy, electron affinity, phase transitions, and other atomic and molecular properties. It is called the Born-Haber cycle.
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Lattice Energy is directly proportional to the Charge on ion and inversely proportional to radius of atom . Now in between NaCl and CsCl the radius of Cs+ is way more than Na+ , even though CsCl is more ionic but still radius is more and hence the lattice energy is less .
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