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Reference.org
Isotopes of krypton
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<p>There are 34 known <a href="/facts/Isotope/KD9B1y6o">isotopes</a> of <a href="/facts/Krypton/llkNlCke">krypton</a> (36Kr) with <a href="/facts/Atomic_mass_number/VyBbJ1oI">atomic mass numbers</a> from 67 to 103. Naturally occurring krypton is made of five <a href="/facts/Stable_isotope/vgcdxgjA">stable isotopes</a> and one (78Kr) which is slightly <a href="/facts/Radioactive/Ya6FVjt4">radioactive</a> with an extremely long half-life, plus traces of <a href="/facts/Radioisotopes/5WpCfbdq">radioisotopes</a> that are produced by <a href="/facts/Cosmic_rays/uxCVdTKd">cosmic rays</a> in the <a href="/facts/Atmosphere/oUpLaGRF">atmosphere</a>. </p>