An atom with an atomic number of 60 has 60 protons and, since it is neutral, also has 60 electrons. The mass number of 125 indicates that the total number of protons and neutrons is 125. Therefore, to find the number of neutrons, you subtract the number of protons from the mass number: 125 - 60 = 65 neutrons. Thus, the atom has 60 protons, 60 electrons, and 65 neutrons.
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