Lattice energy of an ionic compound depends upon

The electronic configurations of four elements $L$,$P$,$Q$,and $R$ are given as: $L (1s^2, 2s^2 2p^4)$; $Q (1s^2, 2s^2 2p^6, 3s^2 3p^5)$; $P (1s^2, 2s^2 2p^6, 3s^1)$; $R (1s^2, 2s^2 2p^6, 3s^2)$. The formulas of the ionic compounds that can be formed between these elements are:

The strongest ionic bond is present in:

Electrovalent compounds do not have

Which of the following substances is the most ionic?

The lattice energy of an ionic compound depends on: