The electron gain enthalpy (with negative sig | vedclass

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(C) The electron gain enthalpy order for halogens is $Cl > F > Br > I$. Due to the small size of the fluorine atom,the incoming electron experiences s

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Smaller size of fluorine atom

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(C) The electron gain enthalpy order for halogens is $Cl > F > Br > I$. Due to the small size of the fluorine atom,the incoming electron experiences significant inter-electronic repulsion from the existing electrons in the compact $2p$ subshell. Therefore,the energy released upon adding an electron to fluorine is less than that for chlorine,resulting in a lower electron gain enthalpy value for fluorine.

The electron gain enthalpy (with negative sign) of fluorine is less than that of chlorine due to:

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