Which cation has the smallest radius?

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Question

(D) The ionic radius decreases as the effective nuclear charge increases for ions with the same number of electrons (isoelectronic species) or across

Vedclass · Accepted Answer

$Be^{2+}$

Vedclass · Answer

(D) The ionic radius decreases as the effective nuclear charge increases for ions with the same number of electrons (isoelectronic species) or across a period.$Li^{+}$ $(Z=3)$ has $2$ electrons.$Be^{2+}$ $(Z=4)$ has $2$ electrons.Since $Be^{2+}$ has a higher nuclear charge $(Z=4)$ than $Li^{+}$ $(Z=3)$,it exerts a stronger pull on the electrons,resulting in a smaller ionic radius.Therefore,$Be^{2+}$ is the smallest.

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