Homework Answers
Lattice energy is directly proportional to product of charges and inversely proportional to sum of ionic radii.
Thus the smaller are the ions , the larger is the lattice energy .
The higher is the charge of cation/anion, the larger is the lattice eenrgy.
So BeO has (+2,-2) charges and the smallest ions
CsI has (+1,-1) charges adn the largest ions.
Thus the order of decreasing lattice energy expected is
BeO > MgS > Kbr > KI > CsI
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