, a diatomic element
is one that, when not chemically bonded
with any other elements, will form a molecule
having two atoms
of the element, such as H2
. Diatomic molecules rarely exist in their atomic form. They include most of the molecular elements or polyatomic molecules
Earth's atmosphere is comprised almost completely (99%) of diatomic oxygen and diatomic nitrogen.
The seven diatomic elements are hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine and iodine. These elements, with the exception of hydrogen, when located on the periodic table, form a numeral "7".