Question:
Which of the following has the least electron gain enthalpy?
Which of the following has the least electron gain enthalpy?
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Smaller atoms tend to have less negative electron gain enthalpy due to stronger electron-electron repulsion.
Updated On: Mar 12, 2025
- Chlorine
- Iodine
- Oxygen
- Sulphur
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The Correct Option is C
Solution and Explanation
Electron gain enthalpy becomes more negative across a period and less negative down a group.
Oxygen and Sulphur belong to Group 16, but due to the smaller size of Oxygen, the added electron experiences greater repulsion, making its electron gain enthalpy less negative than Sulphur.
Among all options, Oxygen has the least electron gain enthalpy.
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