Which of the following atoms should have the | vedclass

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(A) The electron affinity generally increases across a period from left to right due to an increase in effective nuclear charge and a decrease in atom

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$F$

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(A) The electron affinity generally increases across a period from left to right due to an increase in effective nuclear charge and a decrease in atomic size. Among the given elements ($C$, $N$, $O$, $F$), $F$ has the highest effective nuclear charge and the smallest atomic size. Although $Cl$ has the highest electron affinity in the entire periodic table, among the provided options, $F$ has the highest $1^{st}$ electron affinity.

Which of the following atoms should have the highest $1^{st}$ electron affinity?

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