DEAR FIND YOUR ANSWER.....

the enthalpy of atomization for a certain temperature is the heat you have to provide at constant pressure to separate the atoms of an element. It requires an

element(like Li in metallic form and Cl2 in biatomic form or S8 and so on). Lattice energy is the energy necessary to separate ions in an ion lattice. to calculate it you

have to sum the entalpies of atomization of the two elements in gaseous form,