Question

The following ions contain the same number of electrons. Rank them in order of decreasing ionic radii. Rank from largest to smallest radius. To rank items as equivalent, overlap them. Q: Ba^2+ , La^3+ , Te^2- , Cs^+ , I^- , Sb^3-

Answer 1

In general, for isoelectronic ions, the ionic radius decreases as the nuclear charge increases.

This is because an increase in the nuclear charge results in greater attraction of the electrons. Thus, the radius decreases.