 Notable Isotopes  |
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 16O [8 neutrons] |
 Abundance: 99.762
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| Stable with 8 neutrons
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| Most 16O is synthesized at the end of the helium fusion process in stars but some is made in the neon burning process (a set of nuclear
fusion reactions that take place in massive stars, at least 8 solar masses).
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| 17O [9 neutrons] |
| Abundance: 0.038%
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| Stable with 9 neutrons
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| 17O is primarily made by the burning of hydrogen into helium during the CNO cycle, making it a common isotope in the hydrogen burning zones of stars.
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| 18O [10 neutrons] |
| Abundance: 0.205%
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| Stable with 10 neutrons
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| Most 18O is produced when 14N (made abundant from CNO burning) captures a 4He nucleus, making 18O common in the helium-rich zones of stars.
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