Beryllium has two valence electrons. Valence electrons are those electrons that are capable of participating in the formation of chemical bonds with other atoms. These chemical bonds occur through the sharing of these two electrons with other atoms.
Valence electrons get their name from their location within an atom. These electrons are located in outermost shell of an atom, which is known as the valence shell. Because of the location, these electrons are positioned for and are capable of exchange with other atoms. Beryllium possesses an atomic number of 4. Beryllium exists in the form of a hard gray metal.