Effect of correlation on energy of solids

In the present paper we make an attempt to model the lattice energy with the lattice constants through the first-principles calculations. This formalism is designed particularly for application with the self-consistent pseudopotential (PP) method within the density functional (DF) framework and includes exchange and correlation effects. Applying the above formalism we have calculated the lattice energy and correlation energy for a number of solids belonging to groups I-VII and II-VI of the periodic table. The convergence of our results is in the favour of used PP. These results will be helpful in determining various structural and elastic properties of these solids and in the generation of equation of state.