Determine the number of protons, neutrons and electrons in Zn2+ with a mass number of 64:
64 protons, 30 neutrons, 28 electrons
30 protons, 34 neutrons, 28 electrons
30 protons, 64 neutrons, 28 electrons
30 protons, 34 neutrons, 32 electrons
34 protons, 30 neutrons, 2 electrons