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Since cobalt has an atomic number of 27, any isotope of it contains 27 protons and 27 electrons per atom. The isotope with mass number 60 contains (60 - 27) or 33 neutrons per atom. Since cobalt has an atomic number of 27, any isotope of it contains 27 protons and 27 electrons per atom.
(See Appendix 6.) cobalt 57 a radioisotope of cobalt, atomic mass 57, having a half-life of 270 days; used as a label for cyanocobalamin. Symbol 57Co. cobalt 60 a radioisotope of cobalt, atomic mass 60, having a half-life of 5.27 years and a principal gamma ray energy of 1.33 MeV; used as a radiation therapy source. Symbol 60Co.