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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.
Magnesium. The number of protons in an element is always the same as the atomic number, which is 12 in this case. In a neutral atom (no charge), the number of electrons equals the number of protons, so it will be 12 electrons also. However, the number of neutrons will vary depending on the isotope (atoms of the same element with different numbers of neutrons). There are three isotopes of Magnesium, 24Mg, 25Mg, 26Mg, having 12, 13, and 14 neutrons respectively (12 is the most abundant).