Explain why the electron gain enthalpy of fluorine is less negative than that of chlorine..
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The negative electron gain enthalpy of fluorine is less than that of chlorine. It is due to small size of fluorine atom. As a result, there are strong interelectronic repulsions in the relatively small 2p orbitals of fluorine and thus, the incoming electron does not experience much attraction.
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ANSWER--
Even though Fluorine has the highest electronegativity among all the elements and it should have the highest electron gain enthalpy among all the halogens but
this is an exception and chlorine has higher electron gain enthalpy than Fluorine.
The reason for this is that the size of Fluorine atom is very small and hence there is very high inter-electronic repulsion among the electrons of fluorine.
This makes incoming of another electron not very favourable.
Even though fluorine has large negative electron gain enthalpy but for chlorine its even more negative.
Even though Fluorine has the highest electronegativity among all the elements and it should have the highest electron gain enthalpy among all the halogens but
this is an exception and chlorine has higher electron gain enthalpy than Fluorine.
The reason for this is that the size of Fluorine atom is very small and hence there is very high inter-electronic repulsion among the electrons of fluorine.
This makes incoming of another electron not very favourable.
Even though fluorine has large negative electron gain enthalpy but for chlorine its even more negative.
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