Which has more negative electron gain enthalpy than o?
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The release of energy is represented by negative values. The atom in order to gain stability tends to gain electrons Sulphur has more negative electron gain enthalpy than oxygen because when an electron is added to oxygen the added electron goes to smaller n=2 quantum level..
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As F contains one proton more than O, its nucleus can attract the incoming electron more strongly in comparison to the nucleus of O atom. Also, F needs only one more electron to attain the stable noble gas configuration. Hence, the electron gain enthalpy of F is more negative than that of O.
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