The correct order of electron gain enthalpy ($-$ ve value) is :
Solution
Down the group, the size of atom increases, so electron gain enthalpy decreases.
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In case of Oxygen, due to its small size, which leads to electronelectron repulsion, results in less electron gain enthalpy than sulphur.
About this question
Subject: Chemistry · Chapter: Periodic Table and Periodicity · Topic: Periodic Trends
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