chemical element

https://doi.org/10.1351/goldbook.C01022
  1. A species of atoms; all atoms with the same number of protons in the atomic @[email protected]
  2. A pure @[email protected] composed of atoms with the same number of protons in the atomic @[email protected] Sometimes this concept is called the elementary substance as distinct from the chemical element as defined under 1, but mostly the term chemical element is used for both concepts.
Source:
Red Book, 3rd ed., p. 35 [Terms] [Book]
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