For electron gain enthalpies of the elements denoted as , the incorrect option is:

Question

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Strategy:
 Analyze Electron Gain Enthalpy () trends in Group 16. Similar to halogens, the second-period member (Oxygen) is less exothermic than the third-period member (Sulfur) due to inter-electronic repulsion.

Step 1: Review Group 16 values ( in kJ/mol)
- :  (Least exothermic)
- :  (Most exothermic)
- : 
- :

Step 2: Evaluate each option
- (1) : . (Correct)
- (2) : . Incorrect, as  is greater (less negative) than . (Wrong)
- (3) : . (Correct)
- (4) : . (Correct)

Note: In physics/math terms,

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