Which of the following is arranged in decreas | vedclass

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(B) The ions $O^{2-}$,$Mg^{2+}$,and $Al^{3+}$ are isoelectronic species,all having $10$ electrons $(1s^2 2s^2 2p^6)$.For isoelectronic species,the ion

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

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(B) The ions $O^{2-}$,$Mg^{2+}$,and $Al^{3+}$ are isoelectronic species,all having $10$ electrons $(1s^2 2s^2 2p^6)$.For isoelectronic species,the ionic radius decreases as the nuclear charge $(Z)$ increases.The atomic numbers are: $O (Z=8)$,$Mg (Z=12)$,and $Al (Z=13)$.Since the nuclear charge follows the order $O  Mg^{2+} > Al^{3+}$.

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

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