bond number

https://doi.org/10.1351/goldbook.B00705
The number of electron-pair @B00697@ between two nuclei in any given @L03513@. For example, in ethene the bond number between the carbon atoms is two, and between the carbon and hydrogen atoms it is one.
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1090 [Terms] [Paper]
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 updated: February 24, 2014 (v. 2.3.3)