What is the correct order of the first electr | vedclass

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(B) The electron gain enthalpy becomes less negative as we move down the group from $S$ to $Se$. However,oxygen $(O)$ has a very small size,which lead

Vedclass · Accepted Answer

$S > Se > O$

Vedclass · Answer

(B) The electron gain enthalpy becomes less negative as we move down the group from $S$ to $Se$. However,oxygen $(O)$ has a very small size,which leads to strong inter-electronic repulsions between the incoming electron and the electrons already present in the $2p$ subshell. Due to this,the energy released during the addition of an electron to $O$ is less than that for $S$. Therefore,the correct order of electron gain enthalpy (magnitude) is $S > Se > O$.

What is the correct order of the first electron gain enthalpy for $O, S,$ and $Se$?

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