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. That means they both have A charge of zero. Now, in this case, our oxygen becomes negative two, and our H becomes a positive two. And two H's cause A positive two charge.