* Electronegativity: Nonmetals have higher electronegativity than metals. This means they have a stronger attraction for electrons.

* Electron Configuration: Nonmetals tend to have nearly full outer electron shells. Gaining a few electrons allows them to achieve a stable, noble gas configuration.

* Formation of Anions: When nonmetals gain electrons, they acquire a negative charge, becoming anions.

Examples of Anions:

* Oxygen (O²⁻)

* Chlorine (Cl⁻)

* Sulfur (S²⁻)

* Nitrogen (N³⁻)

Exceptions:

While most nonmetals form anions, there are some exceptions, such as the elements in group 14 (carbon, silicon, germanium, tin, lead). These elements can either gain or lose electrons depending on the specific compound.

Important Note: There are some metals that can also form anions, but this is less common.