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  2. Cobalt - Wikipedia

    en.wikipedia.org/wiki/Cobalt

    The isotopes of cobalt range in atomic weight from 50 u (50 Co) to 73 u (73 Co). The primary decay mode for isotopes with atomic mass unit values less than that of the only stable isotope, 59 Co, is electron capture and the primary mode of decay in isotopes with atomic mass greater than 59 atomic mass units is beta decay .