Question

Place the following in order of increasing magnitude of lattice energy. 

MgO Nal Ba O 

Answer 1

Explanation :

Latiice Energy = z1 z1 / r^2

here z1 and z2 are charges. r is the size .

if charge is more then , lattice energy is more. if size is less , then lattice energy is more.

so NaI charge = +1 , -1 . so it has less lattice energy.

BaO and MgO has same charge, but Mg is smaller in size than Ba. so MgO has high lattice energy