Which of the following is arranged in decreas | vedclass

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(B) The given ions are $O^{2-}$,$Mg^{2+}$,and $Al^{3+}$.All these ions are isoelectronic,meaning they all have $10$ electrons ($O^{2-}: 8+2=10$,$Mg^{2

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$O^{2-} > Mg^{2+} > Al^{3+}$

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(B) The given ions are $O^{2-}$,$Mg^{2+}$,and $Al^{3+}$.All these ions are isoelectronic,meaning they all have $10$ electrons ($O^{2-}: 8+2=10$,$Mg^{2+}: 12-2=10$,$Al^{3+}: 13-3=10$).For isoelectronic species,the ionic radius decreases as the nuclear charge (atomic number) increases.The atomic numbers are $O=8$,$Mg=12$,and $Al=13$.Therefore,the decreasing order of size is $O^{2-} > Mg^{2+} > Al^{3+}$.

Which of the following is arranged in decreasing order of size?

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