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(D) All the given ions are isoelectronic,meaning they all have $10$ electrons.$F^{-} = 9 + 1 = 10$ electrons$O^{2-} = 8 + 2 = 10$ electrons$Al^{3+} =

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$N^{3-}$

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(D) All the given ions are isoelectronic,meaning they all have $10$ electrons.$F^{-} = 9 + 1 = 10$ electrons$O^{2-} = 8 + 2 = 10$ electrons$Al^{3+} = 13 - 3 = 10$ electrons$N^{3-} = 7 + 3 = 10$ electronsFor isoelectronic species,the ionic radius increases as the nuclear charge $(Z)$ decreases.The atomic numbers are: $N (7)$,$O (8)$,$F (9)$,$Al (13)$.Since $N^{3-}$ has the lowest nuclear charge $(Z = 7)$,the electrostatic attraction between the nucleus and the electron cloud is the weakest,resulting in the largest ionic size.

Which one of the following is expected to have the largest size?

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