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

Options

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

Answer

B

Explanation

In isoelectronic ions, with increase in nuclear charge, size decreases,
Therefore,` Ca ^(2+) lt K ^(+) lt Cl ^(-) lt S ^(2-)`