(1) MgO has the highest lattice energy.

Which has greater lattice energy?

Because the ionic radii of the cations decrease in the order K ⁺ > Na ⁺ > Li ⁺ for a given halide ion, the lattice energy decreases smoothly from Li ⁺ to K ⁺. Conversely, for a given alkali metal ion, the fluoride salt always has the highest lattice energy and the iodide salt the lowest.

Which has more lattice energy NaCl or KCl?

(ii) K+ is larger than Na+ so NaCl has a higher lattice energy and a higher melting point than KCl. ... When the relative electronegativity of the anion and cation are very different as in NaCl and KCl, the bonding is predominately ionic.