Monatomic vs. Polyatomic

Monatomicadjective

(chemistry) Of an element, consisting of a single atom in the molecule, for example, the noble gases. Note: Strictly speaking, a molecule has at least two atoms.

Monatomicadverb

Consisting of, or containing, one atom; as, the molecule of mercury is monatomic.

Monatomicadjective

of or relating to an element consisting of a single atom;

Polyatomicadjective

(chemistry) (of a molecule or ion) Consisting of three or more atoms.

Polyatomicadjective

Having more than one atom in the molecule; consisting of several atoms.

Polyatomicadjective

of or relating to a molecule made up of more than two atoms