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Class 12 Tuition > Learn Chemistry > Explain why the electron gain enthalpy of fluorine...
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Explain why the electron gain enthalpy of fluorine is less negative than that of chlorine.

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Reveal Chemystery with 2 years teaching experience in engineering college

Due to small size of F and high electron density around F than Cl, it has less tendency to attract electron. Hence, it has less negative electron gain enthalpy than Cl.
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Science and Maths for IX and X; Chemistry and Biology for XI and XII; NEET Tutor

Fluorine is smaller in size and hence when the electron approaches fluorine, it does not have more space to accomodate more electrons and also it have highly negative electron cloud. Thus, it does not accept electron easily and hence the energy emitted on addition of electron is less in case of fluorine...
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Fluorine is smaller in size and hence when the electron approaches fluorine, it does not have more space to accomodate more electrons and also it have highly negative electron cloud. Thus, it does not accept electron easily and hence the energy emitted on addition of electron is less in case of fluorine as compared to chlorine.

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Fluorine has 7 valance electrons and it is smaller in size. So the electron density high around the atom. Addition of electron causes a repelsion between electrons. Therefore it has less tendency to gain electron
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