A covalent bond forms when two atoms share a pair of electrons.

A bond is simply the term used when two atoms share electrons.

Another caveat: In a metal, stationary atoms share a sea of mobile electrons.

In diamond or silicon, the atoms share electrons and form covalent bonds.

Covalent bonds form when atoms share electrons.

Single covalent bonds are formed when two atoms share an edge, as in structure C below.

He also supposed that chemical reactions could occur when two atoms share an electrical charge.

In other words, electron-pair bonds are formed when two atoms share an edge, as in structure C below.

This happens when two atoms share electrons.

In others, the atoms share electrons and form covalent bonds.