oxygen 16 is a stable isotope and has a natural abundance of 99.762%
nitrogen 16 is an unstable isotope with a half life of 7.13 seconds meaning it is nearly nonexistent
joey is probably thinking of nitrogen 14 which is a stable isotope and has a natural abundance of 99.6%
oxygen 16 - https://en.wikipedia.org/wiki/Isotopes_of_oxygen
nitrogen 16/14 - https://education.jlab.org/itselemental/iso007.html
