Monatomic definitions

mŏn'ə-tŏm'ĭk
Occurring as single atoms.

Helium is a monatomic gas.

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Containing one replaceable atom or atomic group.
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Consisting of one atom.
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Having one atom in the molecule.
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(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.
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