The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, `K^+,Ca^(2+), Mg^(2+), Be^(2+)`

Options

A. `Be^(+2) lt K^+ lt Ca^(+2) lt Mg^(+2)`
B. `K^+ lt Ca^(+2) lt Mg^(+2) lt Be^(+2)`
C. `Ca^(+2) lt Mg^(+2) lt Be^(+2) lt K^+`
D. `Mg^(+2) lt Be^(+2) lt K^+ lt Ca^(+2)`

Answer

B