Question

Explain why the electron gain enthalpy of Flourine is less negative than that of chlorine??

Answer 1

Fluorine is highly electronegative. It has a great affinity for the electrons but is not capable of being stable by taking an electron. Wheareas Chlorine has its vaccant d orbitals to give enough vaccancy for the electrons & to be stable. Thus, electron gain enthalpy that denotes stability after gaining electron is higher for the Chlorine than for the Fluorine.

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Answer 2

Explanation:

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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