Explain why the electron gain enthalpy of O is unexpectedly less negative than that of S.
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"Electron Gain Enthalpy"
It defines the "energy released" when an "electron" is added to a "neural gaseous" atom. The values of "Electron Gain Enthalpy" is always negative.
Both Oxygen and Sulphur both are belongs to same group (16).
"Sulphur" has "more negative enthalpy" than "oxygen" because when an "electron" is added to "oxygen", the electron added goes to n = 2 level. Due to smaller sizes, the "inter electron repulsion" increases causing the enthalpy value of the electron to decrease.
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