# What do we call the O_2^(2-) ion?

You gots $\text{peroxide dianion}$...........
And a Lewis structure for ""^(-)O-O^-, which clearly derives from hydrogen peroxide, $H - O - O - H$, which is......
There were $2 \times 1 \left(H\right) + 2 \times 6 \left(O\right)$ valence electrons, i.e. 7 electron pairs to distribute over 4 centres. What is the oxidation state of oxygen in this molecule?