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There are three known stable isotopes of oxygen (8O): 16O, 17O, and 18O. Radioisotopes are known from 11O to 28O, and the most stable are 15O with half-life 122.27 seconds and 14O with half-life 70.62 seconds. All remaining radioisotopes are even shorter in lifetime. The four heaviest known isotopes decay by neutron emission to 24O, whose half-life is 77 milliseconds; 24O, along with 28Ne, have been used in the model of reactions in the crust of neutron stars. The most common decay mode for isotopes lighter than the stable isotopes is β+ decay to nitrogen, and the most common mode after is β− decay to fluorine.
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