Which ions have the smallest radius?

K+, Cl, and S2 form an isoelectronic series with the [Ar] closed-shell electron configuration; that is, all three ions contain 18 electrons but have different nuclear charges. Because K+ has the greatest nuclear charge (Z = 19), its radius is smallest, and S2 with Z = 16 has the largest radius.

Which ion has the smallest radius quizlet?

Ca2+ would have the smallest ionic radius because Calcium has a positive charge, and because this ion is a cation, cations will have the smallest radius. So therefore, elements with a positive charge, will have a smaller ionic radius.

What is the smallest ion?