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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.
2. (c) Because the atomic number of the nucleus is 37, there are 37 protons in the nucleus. Thus, there must be 37 electrons in orbit about the electrically neutral atom. 3. r = 4.8 Ã 10 â15 m 4. (e) According to the discussion in Section 31.1, the nuclear density of all nuclei is approximately the same.5.EASONING a. The number of protons in a given nucleus AZ X is specified by its atomic number Z. b. The number N of neutrons in a given nucleus AZ X is equal to the nucleon number A (the number of protons and neutrons) minus the atomic number Z (the number of protons): N = A â Z (Equation 31.1).