Now, notice we have a double bond here. But it doesn't change the fact that this is a nonpolar covalent bond because we have an oxygen with some amount of protons and a second oxygen with the same amount of protons. Now, another way to look at it is via electronegativity. Now, both atoms have the same amount of electronegativity and that simply means they will attract electrons with the same affinity. And that basically means that our electrons will be found smack in the middle. They'll be equidistant between our two atoms.