Why are $Be$ and $Al$ compounds largely covalent?

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Solution

Covalent compound
Covalent compounds are formed when a molecule is created from the covalent bond. One or more pairs of valence electrons are shared by these substances.
Compounds of $Be$ and $Al$
Aluminum ion have a very high charge, which is $+ 3$ .
The general electronic configuration of $Be$ and $Al$ is $n s^{2} n p^{1}$ .
To lose three electrons, ionization energy is very high $(I E_{1} + I E_{2} + I E_{3})$ .
So, they easily form covalent compounds not ionic.

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