Which halogen has the highest value of negati | vedclass

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(B) The electron gain enthalpy becomes more negative as we move across a period. However,in the case of halogens,Fluorine $(F)$ has a smaller size tha

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Chlorine

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(B) The electron gain enthalpy becomes more negative as we move across a period. However,in the case of halogens,Fluorine $(F)$ has a smaller size than Chlorine $(Cl)$.Due to the small size of the $F$ atom,the incoming electron experiences significant inter-electronic repulsion from the electrons already present in the $2p$ subshell.In contrast,the incoming electron in $Cl$ enters the $3p$ subshell,which is larger,resulting in less inter-electronic repulsion.Therefore,$Cl$ has the highest value of negative electron gain enthalpy among the halogens.

Which halogen has the highest value of negative electron gain enthalpy?

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