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(A) The electron gain enthalpy (or electron affinity) generally becomes less negative as we move down the group from $Cl$ to $I$. However,$F$ has an e

Vedclass · Accepted Answer

$F  Br > I$

Vedclass · Answer

(A) The electron gain enthalpy (or electron affinity) generally becomes less negative as we move down the group from $Cl$ to $I$. However,$F$ has an exceptionally low electron gain enthalpy compared to $Cl$ due to its small size and high inter-electronic repulsion between the incoming electron and the existing electrons in the $2p$ subshell. Therefore,the correct order is $F  Br > I$.

Which of the following represents the correct order of electron gain enthalpy (electron affinity) for halogens?

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