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Meaning of monatomic

mon•a•tom•ic

Pronunciation: (mon"u-tom'ik), [key]
— adj. Chem.
  1. having one atom in the molecule.
  2. containing one replaceable atom or group.
  3. having a valence of one.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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