is hydrogen a molecule
A molecule may be homonuclear, that is, it consists of atoms of a single chemical element, as with oxygen (O 2); or it may be heteronuclear, a chemical compound composed of more than one element, as with water (H 2 O).toms and complexes connected by non-covalent bonds such as hydrogen bonds or ionic bonds are generally not considered single molecules. Molecules as components of matter are common in organic substances (and therefore biochemistry). They also make up most of the oceans and atmosphere.