Cations from smallest to largest Li⁺ ,Na⁺, K⁺ (from Periodic Table, the bigger number of period, the bigger size, of atom, so the bigger size of cation)
1) LiF smaller cation then KF 1,036 <span>853 </span><span>The lattice energy increases as cations get smaller, as shown by LiF and KF. </span><span>I think this one should be correct answer, because the compared substances have also the same anion, and we can compare cations in them.
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