So on this side, on this electron configuration, we have a dioxygen that contains a neutral charge and we have the iron that contains a positive two charge. So it is in its ferro state. But what happens is, because the dioxygen, because the diatomic oxygen consists of these two electronegative atoms, they can pull away an electron readily from that ferrous atom and create a ferric ion that contains a positive three charge. And so one of the electrons will be pulled away from the metal atom and onto the oxygen, giving this diatomic oxygen a negative charge. And this is called a superoxide ion. In fact, this superoxide ferric ion complex is the resonance structure that more closely describes what the structure is between these two atoms, the two oxygen atoms and the single metal atom.