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(C) All the given species are isoelectronic,meaning they all contain $10$ electrons.For isoelectronic species,the ionic radius decreases as the nuclea

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$Si^{4+}$

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(C) All the given species are isoelectronic,meaning they all contain $10$ electrons.For isoelectronic species,the ionic radius decreases as the nuclear charge (atomic number) increases.As the positive charge on the cation increases,the effective nuclear charge increases,which pulls the electrons closer to the nucleus,resulting in a smaller size.Among the given species,$Si^{4+}$ has the highest atomic number $(Z = 14)$ and the highest positive charge,therefore it has the smallest size.

Which among the following isoelectronic species has the smallest size?
$O^{2-}, F^{-}, Ne, Na^{+}, Mg^{2+}, Al^{3+}, Si^{4+}$

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Which among the following isoelectronic species has the smallest size?$O^{2-}, F^{-}, Ne, Na^{+}, Mg^{2+}, Al^{3+}, Si^{4+}$