Which of the following statements is correct?

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Question

(A) The second electron affinity of an element is always endothermic (positive value) because an electron is added to a negatively charged ion,leading

Vedclass · Accepted Answer

The second electron affinity of sulfur is higher than that of oxygen.

Vedclass · Answer

(A) The second electron affinity of an element is always endothermic (positive value) because an electron is added to a negatively charged ion,leading to inter-electronic repulsion. For oxygen,the process $O^-(g) + e^- \rightarrow O^{2-}(g)$ is highly unfavorable due to the small size of the oxygen atom,resulting in a very high positive value. For sulfur,the process $S^-(g) + e^- \rightarrow S^{2-}(g)$ is less unfavorable because the larger size of the sulfur atom reduces inter-electronic repulsion compared to oxygen. Therefore,the second electron affinity of sulfur is less endothermic (lower value) than that of oxygen. Thus,statement $A$ is correct.

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