It makes this atom more negative. So we can also look at atom B as an oxidizing agent, because atom D takes away that electron from A, and it oxidizes A, and that's why it's the oxidizing agent. So Oxidation, or the loss of electrons and reduction or the gain of electron always comes in a pair, the same way that acids are always paired with the base. So let's look at the most common redox reaction out there two H, two molecules combined with a single O, two molecule forming two molecules of water. So on this side, our H two is in its atomic state. It's in its elemental state, and so is oxygen.