Other elements that share two electrons between themselves and
form a diatomic molecule are:
–The
rest of the halogens (Chlorine, Bromine, and Iodine)
–Oxygen
–Nitrogen
Hydrogen and halogens (fluorine, chlorine, bromine and iodine)
share only two electrons between the atoms bonded together.
A covalent bond consisting of only two shared electrons it is
referred to as a single bond.
Oxygen and nitrogen however share 4 and 6 electrons
respectively.
Can you guess why? (Hint: How many electrons do oxygen and
nitrogen atoms need to have a full valence shell?)