Question

when comparing different ionic compounds, the one with the ions of greater size or radius will have a ______ magnitude of lattice energy. same greater smaller

Explanation:

Lattice energy is related to the force between ions, which follows Coulomb's law ($F = \frac{kq_1q_2}{r^2}$). Larger ionic radii ($r$) mean a larger distance between ions, so the magnitude of the force (and thus lattice energy) is smaller (since lattice energy is proportional to $\frac{q_1q_2}{r}$; larger $r$ decreases the value).

Answer:

smaller