What kind of charge does oxygen have?

Oxygen ions have a charge of -2.

Oxygen atoms have 8 protons and 8 electrons. Two electrons are located in the first energy level, and 6 electrons are located in the second energy level.

By adding two electrons to the second energy level, a more stable noble gas is achieved by the oxygen. Since no protons are added the overall charge is -2.

8 protons = +8 10 electrons = -10 Sum = -2

Video from: Noel Pauller

Hope this helps!