"in an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy (a measure of the force needed to pull ions apart); the lattice energy, in turn, affects the enthalpy of solution. based on ion sizes, arrange these compounds by their expected heats of solution." csbr, csi, csf, cscl

As we all know the different atoms and paste in different crystal forms.

Explanation:

And when the atoms are brought from infinity to that position position shall be released the energy that can be released on this occasion of bringing the iron from Infinity 2 in that reformist would give lattice energy now you also know that right only for different crystal formations are different.

Hence have different sizes of Ions to now arranging these compounds in terms of energy they have Starting from most endothermic to the most exothermic compounds are CsF < CsCl < CsBr < CsI also it can be added even for greater values.