The lattice energy for ionic crystals increases as the charge on the ions ________ and the size of the ions ________.
A) increases, increases
B) increases, decreases
C) decreases, increases
D) decreases, decreases
E) None of these is generally correct.

Question

Quizplus · Accepted Answer

The lattice energy is the energy required to separate one mole of an ionic solid into its gaseous ions. As the charge on the ions increases, the lattice energy also increases as there is a greater electrostatic attraction between the positively and negatively charged ions. Similarly, as the size of the ions decreases, the distance between them decreases and the lattice energy increases due to the closer proximity of the ions. Therefore, the correct choice is B, as the lattice energy increases with increasing ion charge and decreasing ion size.

The Lattice Energy for Ionic Crystals Increases as the Charge