TS EAMCET 19-July-2022 Shift 2 Solved Paper

The correct order of ionic radii is
K+>Na+>Mg2+>Al3+.
In this Na+,Mg2+ and Al3+ are isoelectronic species so in these size decreases with rising atomic number because on rising atomic number Z‌eff ‌ increases (Z‌eff ‌=. effective nuclear charge).
Also, K+has the highest ionic radii as it belongs to fourth period and has highest number of shells.