Which of the following species has the highest electron affinity ?

Options

A. `F^(-)`
B. `O`
C. `O^(-)`
D. `Na^(+)`

Answer

B

Explanation

The addition of one `e^(-)` to the mononegative anion is not easy. Hence `E.A` value becomes +ve.
`Na^(o+)` highly stable nuclei. Hence electron affinity will be maximum for O