The increasing order of the ionic radii of the given isoelectronic species is :

Options

A. `CI^(-), Ca^(2+), K^(+), S^(2-)`
B. `S^(2-), CI^(-), Ca^(2+), K^(+)`
C. `Ca^(2+), K^(+), CI^(-), S^(2-)`
D. `K^(+), S^(7-), Ca^(2+), CI^(-)`

Answer

C

Explanation

Order of ionic radii `Ca^(2+) lt K^(+) lt CI^(-) lt S^(2-)`
In isolectronic species, as `Z` increases, size decreases.