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  4. The highest lattice energy corresponds to

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Q. The highest lattice energy corresponds to

AMUAMU 2010The s-Block Elements

Solution:

Lattice energy $\propto$ charge of ion $\propto \frac{1}{\text { size of ion }}$
On moving downward, the size of alkaline earth metals increases due to increase in number of shells.
Thus, $Mg$ has the smallest size. Hence, lattice energy is highest for $MgO$.