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(A) $(i)$ $O$ and $F$ are in the same period. $F$ has a smaller atomic size and higher effective nuclear charge than $O$,allowing it to attract an inc

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$F$ and $Cl$

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(A) $(i)$ $O$ and $F$ are in the same period. $F$ has a smaller atomic size and higher effective nuclear charge than $O$,allowing it to attract an incoming electron more strongly. Thus,$F$ has a more negative electron gain enthalpy than $O$.$(ii)$ Although electron gain enthalpy generally becomes less negative down a group,$Cl$ has a more negative electron gain enthalpy than $F$. This is because the $2p$ subshell of $F$ is very compact,leading to significant inter-electronic repulsions for the incoming electron. In $Cl$,the incoming electron enters the larger $3p$ subshell,where repulsions are lower,making the process more exothermic.

Which of the following pairs of elements would have a more negative electron gain enthalpy?
$(i)$ $O$ or $F$
$(ii)$ $F$ or $Cl$

Similar Questions

Which of the following has the highest electron affinity $(EA)$?

The absolute value of the electron gain enthalpy of halogens satisfies which of the following orders?

The formation of the oxide ion $O_{(g)}^{2-}$ requires first an exothermic and then an endothermic step as shown below. This is because
$O_{(g)} + e^{-} \rightarrow O_{(g)}^{-}; \Delta H^{o} = -142 \ kJ \ mol^{-1}$
$O_{(g)}^{-} + e^{-} \rightarrow O_{(g)}^{2-}; \Delta H^{o} = 844 \ kJ \ mol^{-1}$

The correct order of electron affinity is

Which one of the elements has the maximum electron affinity?

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Which of the following pairs of elements would have a more negative electron gain enthalpy?$(i)$ $O$ or $F$$(ii)$ $F$ or $Cl$