The electron gain enthalpies of halogens decreases in the order of $\mathrm{F}>\mathrm{Cl}>\mathrm{Br}>\mathrm{I}$ comment upon statement.

Predict the formula of the stable binary compound that would be formed by the following pairs of elements:

Aluminium and carbon.

Predict the formula of the stable binary compound formed by the following pairs of elements:

Element with $\mathrm{Z}=113$ and fluorine.

Predict the formula of the stable binary compound formed by the following pairs of elements:

$\mathrm{Uue}$ and $\mathrm{Uus}$.