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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-08-24 and was most recently seen on 2026-08-24.
Naturally occurring cadmium (48Cd) is composed of 8 isotopes. For two of them, natural radioactivity has been observed, and three others are predicted to possibly decay though this has not been observed; it may be presumed the half-lives are extremely long. The two natural radioactive isotopes are 113Cd (beta decay, half-life 8.04×1015 years) and 116Cd (double beta decay, half-life 2.69×1019 years). The other three are 106Cd, 108Cd (double electron capture), and 114Cd (double beta decay); only lower limits on their decays have been set. Only three isotopes—110Cd, 111Cd, and 112Cd—are theoretically stable. Among the isotopes absent in natural cadmium, the most long-lived are 109Cd with a half-life of 461.3 days, and 115Cd with a half-life of 53.46 hours. All of the remaining radioactive isotopes have half-lives that are less than 7 hours and the majority of these are less than 5 minutes. This element also has 12 known meta states, with the most stable being 113mCd (t1/2 13.9 years), 115mCd (t1/2 44.6 days) and 117mCd (t1/2 3.44 hours).
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