The correct order of decreasing ionic radii among the following isoelectronic species is

Options

A. `K^(+) gt Ca^(2+) gt Cl^(-) gt S^(2-)`
B. `Ca^(2+) gt K^(+) gt S^(2-) gt K^(+)`
C. `Cl^(-) gt S^(2) gt Ca^(2+) gt K^(+)`
D. `S^(2-) gt Cl^(-) gt K^(+) gt Ca^(2+)`

Answer

D

Explanation

Among the isoelectronic ions, ionic radii decreases as the magnitude of -ve charge decreases or the magnitude of +ve charge increases.