![]() If the goal is to maximize the lattice energy then you'd want ions with larger magnitude charges and/or small in size ions. So both the magnitude of the ion's charges and their atomic radii effect the lattice energy. And the denominator consists of of the distance between the two ions, squared. If we observe the equation of Coulomb's Law the numerator consists of the product of the absolute value of the charges of the ions. ![]() So lattice energy is measuring how attracted both the ions are to each other in an ionic compound. In ionic compounds the force is always attractive since the ions have different charges. Whether the force is attractive or repulsive depends on whether the charges have the same sign or not. Coulomb's Law describes the force of attraction (or repulsion) between two point charges.
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