Explain the trend in the lattice energies (shown here) of the alkaline earth metal oxides.
The given table shows decreasing values of lattice energies for the oxides of alkaline earth
metals as we go down a group in the periodic table. Since atomic size increases down a group,
the distance between the metal ion and the anion increases. Potential energy decreases as
distance between the charges increases according to Coulomb's law. So the oxides of larger
metal cations have lower potential energy. This causes lower lattice energies as shown in the
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