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  4. The correct order of electron gain enthalpy with negative sign of F, Cl, Br, and I, having atomic number 9,17,35 and 53 respectively, is

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Q. The correct order of electron gain enthalpy with negative sign of $F, Cl, Br$, and $I$, having atomic number $9,17,35$ and $53$ respectively, is

AMUAMU 2013Classification of Elements and Periodicity in Properties

Solution:

The electron affinity of $F$ is less than $Cl$ due to small size of $2p$ orbital of $F$ atom than $3 p$ orbital of $Cl$ atom. The negative value of electron gain enthalpy is the highest.
$Cl > F > Br > I$