In: Physics
Answer :
Cohesive energy: It is the energy that must be supplied to the solid to separate its constituents into neutral free atoms at rest and at infinite separation with the same electronic configuration.
There are three forces responsible for the cohesion of a solid:
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The lattice energy of a solid: It is the energy that must be supplied to an ionic crystal to separate its constituents into free ions at rest and at infinite separation.
Lattice energy is the amount of energy required to completely separate one mole of a solid crystalline ionic compound into it's constituent gaseous ions. The term lattice energy normally refers to electrostatic (coulombic) interactions between cations and anions in an ionic lattice.