For which of these elements would the electron affinity process shown be least favorable?

Question

1. H + e− ! H−
2. Li + e− ! Li−
3. F + e− ! F−
4. O + e− ! O−
5. N + e− ! N−

Answer 1

My best guess would have been Li, but apparently the answer is N, which has almost zero electron affinity.

See
http://www.webelements.com/periodicity/electron_affinity/
for value for those elements. (Drag the cursor to the element.)