Oxygen-16, 16O
Namesoxygen-16, O-16
Nuclide data
Natural abundance99.76%
Isotope mass15.99491461956 u
Excess energy−4737.00135(16)[1] keV
Binding energy7976.206[1] keV
Isotopes of oxygen
Complete table of nuclides

Oxygen-16 (16O) is a stable isotope of oxygen, having 8 neutrons and 8 protons in its nucleus. It has a mass of 15.99491461956 u. Oxygen-16 is the most abundant isotope of oxygen and accounts for 99.762% of oxygen's natural abundance.[2] The relative and absolute abundance of 16O are high because it is a principal product of stellar evolution and because it is a primordial isotope, meaning it can be made by stars that were initially made exclusively of hydrogen. Most 16O is synthesized at the end of the helium fusion process in stars; the triple-alpha process creates 12C, which captures an additional 4He to make 16O. The neon-burning process creates additional 16O.

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  1. ^ a b Wang, M.; Audi, G.; Kondev, F. G.; Huang, W. J.; Naimi, S.; Xu, X. (2017). "The AME2016 atomic mass evaluation (II). Tables, graphs, and references" (PDF). Chinese Physics C. 41 (3): 030003–8. 10.1088/1674-1137/41/3/030003.
  2. ^ "Table of Isotopic Masses and Natural Abundances" (PDF). 1999.