element effect

https://doi.org/10.1351/goldbook.E02036
The ratio of the rate constants of two reactions that differ only in the identity of the element of the atom in the leaving group, e.g. kBrkCl. As for isotope effects, a ratio of unity is regarded as a 'null effect'.
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1111 [Terms] [Paper]
Citation: 'element effect' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.E02036 RIS BibTex EndNote
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Last revised: February 24, 2014