Question

Second electron affinity of an element is:

• A. always exothermic
• B. endothermic for few elements
• C. exothermic for few elements
• D. always endothermic

Answer 1

The correct option is D always endothermic

If we want to add one more electron after the addition of one electron then the incoming electron will face repulsions from the electrons in valence shells. So we need to provide some energy if we want to add one more electron to $M^{-}$ ion. Hence the second electron affinity of an element is endothermic.