Properties Of Zn-66 Isotope: Property Zn-66 Neutron Number (N) 36 Atomic Number / Proton Number (Z) 30 Mass Number / Nucleon Number (A) 66 Natural Abundance (%) 0.2773 Click to see full answer. Correspondingly, how many protons neutrons and electrons does zinc 66 have? Name Zinc Atomic Mass 65.39 atomic mass units Number of Protons 30 Number of Neutrons 35 Number of Electrons 30 Secondly, what is the mass number of zinc 66? In your case, you would have zinc-66, a nuclide of zinc that has a mass number equal to 66 . Now, an atom’s mass number, A , tells you the number of protons, which is given by the atomic number, Z , and neutrons present inside the atom’s nucleus. Likewise, people ask, how many neutrons does zinc 67 have? I count 67−30=37 neutrons .How many energy shells does Zn have?Zinc atoms have 30 electrons and the shell structure is 2.8. 18.2.