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The correct order of electron gain enthalpy in group 16 elements is;
A
O > S > Se
B
S > O > Se
C
S > Se > O
D
Se > S > O
Explanation
Electron gain enthalpy become less negative as we go down a group. However, electron gain enthalpy of O is least in its group because when an electron is added to O, the added electron goes to the smaller n = 2 quantum level and suffers significant repulsion from the other electrons present in this level.
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