The charge of O2 (dioxygen) is zero.
Oxygen (O) is a diatomic molecule, meaning it naturally occurs as O2, with two oxygen atoms chemically bonded together. In this form, the overall charge of the molecule is neutral, as each oxygen atom has a charge of -2 and there are two oxygen atoms, resulting in a total charge of -4. However, since the overall molecule is electrically neutral, the charge of O2 is zero.