We know that sodium is atomic number 11, and it has 11 protons,11 electrons (in a neutral atom), and will have 12 neutrons in itssodium-23 isotope. Sulfur is atomic number 16, and will have 16protons, 16 electrons (in a neutral atom), and will have 16neutrons in it sulfur-32 isotope. Oxygen has atomic number 8, andhas 8 protons, 8 electrons (in a neutral atom) and will have 8neutrons in its oxygen 16 isotope. If we take 2 sodium atoms, asulfur atom and 4 oxygen atoms, we'll have a total of 70 protons,72 neutrons and 70 electrons in sum.