09063 IUPAC Gold Book - electron number of an electrochemical reaction 10.1351/goldbook.09063 09063 current synonyms: charge number, number of electrons transferred 1 Number of electrons transferred in a charge transfer reaction between an electrode and a single entity (ion, radical-ion, or molecule) of an electroactive substance, whose identity must be specified. The apparent number of electrons transferred, \(z_{\rm{app}}\), represents the experimentally measured number of electrons transferred between an electrode and one electroactive substance species, whose identity must be specified. When the electrooxidation or electroreduction of a substance \(\ce{B}\) is accompanied by chemical processes, such as the catalyzed or induced reduction of a second substance, or a side reaction that consumes \(\ce{B}\) or an intermediate, the value of \(z_{\rm{app}}\) will differ from that of \(z\). Symbol \(n\) is commonly used when there is no risk of confusion with an amount of substance. Charge number is used in in the IUPAC Green Book. PAC, 2020, 92, 641. 'Terminology of Electrochemical Methods of Analysis (IUPAC Recommendations 2019)' on page 648 (https://doi.org/10.1515/pac-2018-0109) https://goldbook.iupac.org/terms/view/09063/html https://goldbook.iupac.org/terms/view/09063/json https://goldbook.iupac.org/terms/view/09063/plain Citation: 'electron number of an electrochemical reaction' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.09063 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-05-01T09:56:17+00:00