The charges and sizes of the ions in an ionic compound affect the strength of the electrostatic interaction between the ions and thus the strength of the lattice energy of the ionic compound. Arrange the compounds according to the magnitudes of their lattice energies based on the relative ion charges and sizes.

The options in the question are:

MgCl2, MgS, KBr, NaCl

Answer:

Explanation:

Lattice energy depends the relative sizes and charges of the ions present in the lattice.

According to this model, ionic compounds with lower lattice energy tend to be more soluble in water. Recall that this consideration of ion size and magnitude of charge only refer to the strength of electrostatic interaction in an ionic bond or lattice energy of an ionic compound.

Based on the options listed, the order of decreasing lattice energy is:

MgS>MgCl2> NaCl>KBr