In which one of the following pairs the radius of the second species is greater than that of first ?

Options

A. `Ti^(4+),Mn^(7+)`
B. `Na, Mg`
C. `Cl^(-),K^(+)`
D. `P^(5+),P^(3+)`

Answer

D

Explanation

As oxidation state increases, the radius of the species decreases on account of higher proton to electron ratio.
`P^(5+),"no. of proton"=15,"no. of electrons"=10=15//10`
`P^(3+),"no. of proton" =15,"no. of electrons"=12=15//12`