Question

Which shows the highest lattice energy?

• A. $RbF$
• B. $CsF$
• C. $NaF$
• D. $KF$

Answer 1

The correct option is C $NaF$

$L.E.\propto \frac{q_1{q}_2}{r}$

$NaF$ shows the highest lattice energy. Smaller the size of cation, more is attraction among ions. The bond between ions of opposite charge is strongest when the ions are small. The lattice energies for the alkali metal halides is therefore highest for $NaF$.