elementary entity

https://doi.org/10.1351/goldbook.E02033
Any countable object or event, but usually a molecule, an ion or a specified group of atoms.
Source:
Physical Chemistry Division, unpublished [Terms]
Cite as: IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.
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Last revised: February 24, 2014