explain why the electron gain enthalphy of fluorine is less than that of chlorine
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Chlorine has higher electron gain enthalpy than fluorine because due to small size of fluorine some energy is utilized in overcoming the force of repulsion among electrons. Hence it has lesser value of electron affinity.
Fluorine, though higher than chlorine in the periodic table, has a very small atomic size. This makes the fluoride anion so formed unstable (highly reactive) due to a very high charge/mass ratio. Where as chlorine just has the perfect size. As a result, fluorine has an electron gain enthalpy less than that of Chlorine :D
Reduction of a fluorine atom should release more energy, as the fluorine atom is smaller, and has a higher effective nuclear charge than chlorine.
There are various definitions of this reaction. I hope I have got the one you want
Fluorine, though higher than chlorine in the periodic table, has a very small atomic size. This makes the fluoride anion so formed unstable (highly reactive) due to a very high charge/mass ratio. Where as chlorine just has the perfect size. As a result, fluorine has an electron gain enthalpy less than that of Chlorine :D
Reduction of a fluorine atom should release more energy, as the fluorine atom is smaller, and has a higher effective nuclear charge than chlorine.
There are various definitions of this reaction. I hope I have got the one you want
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