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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.
Cobalt is a lustrous, silvery-blue metallic chemical element, symbol Co, atomic number of 27 and an atomic weight of 58.93. Cobalt is obtained primarily as a by-product of the mining and processing of copper and nickel ores.