monatomic
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mon·a·tom·ic
(mŏn′ə-tŏm′ĭk)adj.
Occurring as single atoms: Helium is a monatomic gas.
mon′a·tom′ic·al·ly adv.
monatomic
(ˌmɒnəˈtɒmɪk) ormonoatomic
adj
1. (Chemistry) (of an element) having or consisting of single atoms: argon is a monatomic gas.
2. (Chemistry) (of a compound or molecule) having only one atom or group that can be replaced in a chemical reaction
3. (Chemistry) a less common word for monovalent
mon•a•tom•ic
(ˌmɒn əˈtɒm ɪk)adj.
1. having one atom in the molecule.
2. containing one replaceable atom or group.
3. having a valence of one.
[1840–50]
mon`a•tom′i•cal•ly, adv.
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| Adj. | 1. |  monatomic - of or relating to an element consisting of a single atom; "helium and argon are monatomic gases" |