Which element from the following has the larg | vedclass

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(B) Atomic size increases down a group due to the addition of new electron shells and decreases across a period from left to right due to an increase

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$Se$

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(B) Atomic size increases down a group due to the addition of new electron shells and decreases across a period from left to right due to an increase in effective nuclear charge.In the periodic table,$S$ and $Cl$ belong to period $3$,while $Se$ and $Br$ belong to period $4$.Since $Se$ and $Br$ are in a higher period,they have larger atomic sizes than $S$ and $Cl$.Within period $4$,$Se$ is to the left of $Br$,so $Se$ has a larger atomic size than $Br$.Therefore,the atomic size order is $Cl < S < Br < Se$,making $Se$ the element with the largest atomic size.

Which element from the following has the largest atomic size compared to the other three?

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