Here's why:

* Covalent bonding involves the sharing of electrons between atoms.

* Nonmetals generally have a high electronegativity (a tendency to attract electrons).

* When nonmetals bond, they share electrons to achieve a stable electron configuration, rather than transferring electrons like in ionic bonding.

Examples of covalent compounds:

* Water (H₂O)

* Carbon dioxide (CO₂)

* Methane (CH₄)

* Ethanol (C₂H₅OH)

Important Note: While nonmetals typically form covalent compounds, there are exceptions, such as hydrogen (H) which can form covalent bonds with nonmetals and ionic bonds with metals.