Order the following compounds according to their expected lattice energies:
MgBr2, AlBr3, LiBr, AlCl3.
Express your answers as chemical formulas. Enter your answers in order of decreasing expected lattice energy separated by commas.

Lattice energy of the ionic compounds takes the following decline in trend: i.e AlCl3, AlBr3, MgBr3, LiBr.

Explanation:

The factors that determine lattice energies of ionic compound are:

Across the period (on the periodic table), Mg has a higher ionic radius (smaller lattice energy) than Al. Conversely from to there is increase in lattice energies caused by increase in ionic radii down the group.

Hence the order of lattice energies from largest to smallest is:

a chemical reaction

explanation: