Homonuclear molecule

Molecule composed of one element

In chemistry, homonuclear molecules, or homonuclear species, are molecules composed of only one element. Homonuclear molecules may consist of various numbers of atoms. The size of the molecule an element can form depends on the element's properties, and some elements form molecules of more than one size. The most familiar homonuclear molecules are diatomic molecule, which consist of two atoms, although not all diatomic molecules are homonuclear. Homonuclear diatomic molecules include hydrogen, oxygen, nitrogen and all of the halogens. Ozone is a common triatomic homonuclear molecule. Homonuclear tetratomic molecules include arsenic and phosphorus.

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