Now, what exactly is the structure that describes this complex here? Well, this complex between the metal atom and the diatomic oxygen can be described by a resonant stabilized structure as shown on the board. So these are the two electron structures that describe the resonance stabilized complex between our fe atom and the diatomic oxygen. 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.