Isotopes of cobalt

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Naturally occurring cobalt, Co, consists of a single stable isotope, 59Co (thus, cobalt is a mononuclidic element). Twenty-eight radioisotopes have been characterized; the most stable are 60Co with a half-life of 5.2714 years, 57Co (271.81 days), 56Co (77.24 days), and 58Co (70.84 days).

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