Which of the following has the strongest bond?

Magnesium reacts with an element $(X)$ to form an ionic compound. If the ground state electronic configuration of $(X)$ is $1s^{2} 2s^{2} 2p^{3},$ the simplest formula for this compound is

Which of the following statements is correct for $CsBr_3$?

In which of the following species are the bonds non-directional?

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

Which pair will form the most stable ionic bond?