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(D) Effective nuclear charge $(Z_{eff})$ increases across a period from left to right due to an increase in atomic number while the shielding effect r

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fluorine

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(D) Effective nuclear charge $(Z_{eff})$ increases across a period from left to right due to an increase in atomic number while the shielding effect remains relatively constant.Among the given elements ($Li$,$Be$,$O$,$F$),all belong to the second period.Fluorine $(F)$ has the highest atomic number $(Z = 9)$,which results in the strongest attraction between the nucleus and the valence electrons,making its effective nuclear charge the maximum.

Effective nuclear charge is maximum in case of

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