Which of the following species has the smallest size?

Question

Accepted Answer

Among $Na^+, Mg^{2+}, Al^{3+}, F^-$, all are isoelectronic (10 electrons). $Al^{3+}$ has the highest nuclear charge ($Z=13$), hence it pulls electrons closest and has the smallest radius.

Classification of Elements and Periodicity in Properties

❓ Sibling Questions in this Chapter