# Which would have more electron affinity: O or O-?

The electron affinity has been tabulated for atomic oxygen (of course, it is measured under specific conditions. Now, even though the 2nd reduction of oxygen anion (to give the dianion, ${O}^{2 -}$) generates an electronically stable entity, I am willing to bet that it would be easier to reduce a NEUTRAL species, than an anion. Why? Well, on purely electrostatic grounds, it should be more difficult to add an electron to an already negative species.