Increasing order of atomic radii is

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(A) All the given species are isoelectronic,each containing $10 \ e^{-}$.For isoelectronic species,the ionic radius decreases as the nuclear charge (a

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$Mg^{2+} < Na^{+} < Ne < F^{-} < O^{2-}$

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(A) All the given species are isoelectronic,each containing $10 \ e^{-}$.For isoelectronic species,the ionic radius decreases as the nuclear charge (atomic number) increases.$Mg^{2+}$ $(Z=12)$,$Na^{+}$ $(Z=11)$,$Ne$ $(Z=10)$,$F^{-}$ $(Z=9)$,$O^{2-}$ $(Z=8)$.As the nuclear charge increases,the electrons are pulled more strongly towards the nucleus,resulting in a smaller radius.Therefore,the increasing order of radii is $Mg^{2+} < Na^{+} < Ne < F^{-} < O^{2-}$.

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