Effect of Ionic Charge on Lattice Energy
Compare LiF and MgO: Li+ and Mg2+ have similar radii, and
F- and O2- have similar radii.
˛Holattice (LiF) = -1050 kJ/mol ˛Holattice (MgO) = -3923 kJ/mol
The nearly four-fold larger value for MgO reflects the difference in
the product of the charges (12 vs 22) in the numerator of the
electrostatic energy equation (monovalent vs divalent ions).
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