{"term":{"id":"03332","title":"isotopic abundance","longtitle":"IUPAC Gold Book - isotopic abundance","doi":"10.1351\/goldbook.I03332","code":"I03332","status":"current","definitions":[{"id":1,"text":"The relative number of atoms of a particular isotopes in a mixture of the isotopes of an element, expressed as a fraction of all the atoms of the element.","links":[{"term":"isotopes","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/I03331"}],"sources":["PAC, 1982, 54, 1533. 'Glossary of terms used in nuclear analytical chemistry (Provisional)' on page 1535 (https:\/\/doi.org\/10.1351\/pac198254081533)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/I03332\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/I03332\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/I03332\/plain"},"citation":"Citation: 'isotopic abundance' 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.I03332","license":"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.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"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.","accessed":"2026-07-31T19:24:48+00:00"}}