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(A) Atomic radius generally increases down a group and decreases across a period from left to right.$1$. Comparing elements in the same period ($2^{nd

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$F < O < C < Cl < Br$

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(A) Atomic radius generally increases down a group and decreases across a period from left to right.$1$. Comparing elements in the same period ($2^{nd}$ period): $C > O > F$.$2$. Comparing elements in the same group ($17^{th}$ group): $Br > Cl > F$.$3$. Combining these trends: $F$ is the smallest (top-right),followed by $O$ and $C$. $Cl$ and $Br$ are larger than elements of the $2^{nd}$ period.$4$. The correct order is $F < O < C < Cl < Br$.

Which of the following represents the correct order of atomic radii?

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