explain why the electron gains enthalpy of fluorine is less than that of chlorine
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Because chlorine has more negative electron gain enthalpy than fluorine..
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Electron gain enthalpy of F is less negative than that of Cl because when an electron is added to F,the added electron goes to the smaller n=2 quantam level and suffers repulsion from other electons present in this level. In case of Cl,the added electron goes to the larger n=3 quantam level and suffers much less repulsion from other electron..
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