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Why is the electron gain enthalpy of O or F less negative than that of the succeeding element (S or Cl)?
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Oxygen and fluorine have higher electron-electron repulsion.
The electron gain enthalpy of O or F is less negative than that of the succeeding element (S or Cl) because when an electron is added to O or F, 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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