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(D) The electron affinity of elements generally increases across a period and decreases down a group. However,there are exceptions due to electronic c

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Bromine is less than chlorine

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(D) The electron affinity of elements generally increases across a period and decreases down a group. However,there are exceptions due to electronic configuration and atomic size. $1$. The electron affinity of $S$ $(200 \ kJ/mol)$ is greater than that of $O$ $(141 \ kJ/mol)$ because of the small size of $O$,which leads to inter-electronic repulsion. $2$. The electron affinity of $Cl$ $(349 \ kJ/mol)$ is greater than that of $Br$ $(325 \ kJ/mol)$. Therefore,the statement that $Br$ is less than $Cl$ is correct.

Which of the following statements regarding electron affinity is correct?

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$D$. $I$ and $At$
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