Two elements have electronegativity of $1.2$ and $3.0$. The bond formed between them would be:

The lattice energy of the lithium halides is in the following order:

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:

Which of the following has the highest lattice energy?

Which of the following substances has the highest melting point?

Why does molten sodium chloride conduct electricity?