Problem: Consider the following trend in the lattice energies of the alkaline earth metal oxides:Metal OxideLattice Energy (kJ/mol)MgO-3795CaO-3414SrO-3217BaO-3029Explain this trend.

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We are being asked to explain the following the trend in the lattice energies of the alkaline earth metal oxides:

Metal OxideLattice Energy (kJ/mol)
MgO-3795
CaO-3414
SrO-3217
BaO-3029


Recall:

Lattice Energy=|cation charge·anion charge|cation radius + anion radius

Radius = period (i.e. the row in the periodic table) number


ā€¢ To determine the cation and anion charge, recall that some elements have common charges based on what group they belong to on the periodic table:

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Problem Details
Consider the following trend in the lattice energies of the alkaline earth metal oxides:


Metal OxideLattice Energy (kJ/mol)
MgO-3795
CaO-3414
SrO-3217
BaO-3029


Explain this trend.