In which pair does the first element have a h | vedclass

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(D) The effective nuclear charge $(Z_{eff})$ generally increases across a period from left to right due to the addition of electrons in the same shell

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$F, O$

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(D) The effective nuclear charge $(Z_{eff})$ generally increases across a period from left to right due to the addition of electrons in the same shell while the nuclear charge increases.For option $A$: $Z_{eff}$ of $Be$ $(1.95)$ For option $B$: $Z_{eff}$ of $C$ $(3.25)$ For option $C$: $Z_{eff}$ of $Na$ $(2.20)$ > $Z_{eff}$ of $K$ ($2.20$ is not correct,$Na$ is $2.20$ and $K$ is $2.20$ approximately,but $Na$ is in a higher group period context,actually $Z_{eff}$ decreases down the group).For option $D$: $Z_{eff}$ of $F$ $(5.20)$ > $Z_{eff}$ of $O$ $(4.55)$.Therefore,in the pair $(F, O)$,the first element $(F)$ has a higher $Z_{eff}$ than the second element $(O)$.

In which pair does the first element have a higher $Z_{eff}$ than the second atom?

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