Question

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

Answer 1

You gots `"peroxide dianion"`...........

Explanation:

And a Lewis structure for `""^(-)O-O^-`, which clearly derives from hydrogen peroxide, `H-O-O-H`, which is......

There were `2xx1(H) + 2xx6(O)` valence electrons, i.e. 7 electron pairs to distribute over 4 centres. What is the oxidation state of oxygen in this molecule?