Which would have more electron affinity: O or O-?
What would you think on purely electrostatic grounds?
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,
How do we find an answer? I could not do so on the web, and I haven't got access to a good text. But please look at a text, and see if you can find successive electron affinities.