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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.
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 most abundant stable isotope, 59 Co, is electron capture and the primary mode of decay for those of greater than 59 atomic mass units is beta decay.obalt is a ferromagnetic metal with a specific gravity of 8.9. The Curie temperature is 1,115 Â°C (2,039 Â°F) and the magnetic moment is 1.6â1.7 Bohr magnetons per atom. Cobalt has a relative permeability two-thirds that of iron.