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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.
Example: Determine the activity (in Curies) of a 2.00 mg sample of Cobalt-60. 1  First, we need to convert the 2.00 mg sample of cobalt-60 into numbers of atoms. 2  Second, we use the rate equation to calculate the activity in atoms/second and then convert the answer into curies.xample: A 1.00 g sample of cobalt-60 (59.92 g/mol) has an activity of 1.1 x 10 3 Ci. Determine the rate constant. 1  First, we need to convert the 1.00 g of sample into number of atoms of cobalt-60 and to convert the activity into numbers of atoms that decay per second.