Question

The species among the following having the highest electron affinity is:

• A. $O$
• B. $F^{-}$
• C. $C{l}^{-}$
• D. $O^{-}$

Answer 1

The correct option is A $O$

Fluoride and chloride ions have a complete octet configuration. Hence, they are not ready to accept an electron. When adding one more electron to the uninegative oxygen anion, electron-electron repulsion will occur and makes the reaction endothermic.

Hence, the oxygen atom has the highest electron affinity among other given options.