Which of the following is an ionic compound?

Write the favourable factors for the formation of ionic bond.

The most predominantly ionic compounds will be obtained from the combination of elements belonging to

The lattice energies of $NaCl$,$NaF$,$KCl$,and $RbCl$ follow the order:

Two elements $X$ and $Y$ have the following electron configurations:
$X = 1s^2, 2s^2 2p^6, 3s^2 3p^6, 4s^2$
$Y = 1s^2, 2s^2 2p^6, 3s^2 3p^5$
The compound formed by the combination of $X$ and $Y$ is:

Anhydrous aluminium chloride $(Al_2Cl_6)$ is a covalent compound and soluble in water,giving: