Science, Tech, Math › Science Bond Length Definition in Chemistry What Is Bond Length? Print ALFRED PASIEKA/SCIENCE PHOTO LIBRARY / Getty Images Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. Learn about our Editorial Process Updated on January 13, 2020 In chemistry, bond length is the equilibrium distance between the nuclei of two groups or atoms that are bonded to each other. Bond length is a property of a chemical bond between types of atoms. Bonds vary between atoms depending on the molecule that contains them. For example the carbon-hydrogen bond is different in methyl chloride as is methane. When more electrons participate in a bond, it tends to be shorter. Bond lengths in solids are measured using x-ray diffraction. In gases, length may be approximated using microwave spectroscopy. Example Bond Lengths Read More Bond Order Definition and Examples By Anne Marie Helmenstine, Ph.D. Bond lengths are measured in picometers (pm). Example lengths for carbon include: C-H single bond: 106-112 pmC-C single bond: 120-154 pmC-Te single bond: 205 pm The trend follows that of atomic radius. Bond distances increasing moving down a group of the periodic table and decrease moving across a row or period. Sources Huntley D. R.; Markopoulos G.; Donovan P. M.; Scott L. T.; Hoffmann R. (2005). "Squeezing C–C Bonds." Angewandte Chemie International Edition. 44 (46): 7549–7553. doi:10.1002/anie.200502721 Cite this Article Format mla apa chicago Your Citation Helmenstine, Anne Marie, Ph.D. "Bond Length Definition in Chemistry." ThoughtCo, Aug. 29, 2020, thoughtco.com/bond-length-definition-602119. Helmenstine, Anne Marie, Ph.D. (2020, August 29). Bond Length Definition in Chemistry. Retrieved from https://www.thoughtco.com/bond-length-definition-602119 Helmenstine, Anne Marie, Ph.D. "Bond Length Definition in Chemistry." ThoughtCo. https://www.thoughtco.com/bond-length-definition-602119 (accessed April 25, 2024). copy citation