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Q.
Which compound will show the highest lattice energy ?
The s-Block Elements
Solution:
With the same anion, smaller the size of the cation, higher is the lattice energy. The correct order of size of cations is -
$Na ^{+}< K ^{+}< Rb ^{+}< Cs ^{+}$
Hence, the lattice energy of $NaF$ will be maximum.