monatomic(redirected from M-state)
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monatomic, monoatomic Chem
1. (of an element) having or consisting of single atoms
2. (of a compound or molecule) having only one atom or group that can be replaced in a chemical reaction
3. a less common word for monovalent
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Composed of one atom.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.