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Reference.org
Isotopes of oxygen
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<p>There are three known stable <a href="/facts/Isotope/KD9B1y6o">isotopes</a> of <a href="/facts/Oxygen/acyn6o8r">oxygen</a> (8O): <a href="/facts/Oxygen-16/osheCBxR">16O</a>, <a href="/facts/Oxygen-17/LBY5W95R">17O</a>, and <a href="/facts/Oxygen-18/fK0gerlA">18O</a>. </p><p><a href="/facts/Radioactive_isotope/5WpCfbdq">Radioactive isotopes</a> ranging from 11O to 28O have also been characterized, all short-lived. The longest-lived radioisotope is 15O with a <a href="/facts/Half-life/kGVH8BAB">half-life</a> of 122.266(43) <a href="/facts/Second/jtFxnJXx">s</a>, while the shortest-lived isotope is the <a href="/facts/Nuclear_drip_line/k3PfJUoy">unbound</a> 11O with a half-life of 198(12) <a href="/facts/Yoctoseconds/bEovB6Tp">yoctoseconds</a>, though half-lives have not been measured for the unbound heavy isotopes 27O and 28O. </p>