Which ion has the lowest radius from the foll | vedclass

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(D) All the given ions ($Na^{+}$,$Mg^{2+}$,$Al^{3+}$,and $Si^{4+}$) are isoelectronic species,meaning they all contain $10$ electrons.For isoelectroni

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$Si^{4+}$

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(D) All the given ions ($Na^{+}$,$Mg^{2+}$,$Al^{3+}$,and $Si^{4+}$) are isoelectronic species,meaning they all contain $10$ electrons.For isoelectronic species,the ionic radius decreases as the nuclear charge (atomic number) increases.Since $Si^{4+}$ has the highest atomic number $(Z = 14)$ among the given ions,it exerts the strongest attraction on the electrons,resulting in the lowest ionic radius.Therefore,the correct option is $(D)$.

Ion	Radius $(pm)$
$Q^{a+}$	$53$
$X^{b+}$	$66$
$Y^{c+}$	$40$
$Z^{d+}$	$100$

Which ion has the lowest radius from the following ions?

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