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+)?

The charge/size ratio of a cation determines its polarizing power. Whi

1.	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+)?
Answer» `CA^(2+) lt Mg^(2+ ) lt Be^(2+ ) lt K^(+)` `Mg^(2+ ) lt Be^(2+) lt K^(+) lt Ca^(2+)` `Be^(2+ ) lt K^(+) lt Ca^(2+) lt Mg^(2+)` `K^(+) ltCa^(2+) ltMg^(2+) ltBe^(2+)` SOLUTION :`K^(+) ltCa^(2+) ltMg^(2+) ltBe^(2+)` HIGH charge and small size of the CATIONS increases pol.arisation. As the size of the given cations decreases as `K^(+) gt Ca^(2+) gt Mg^(2+) gt Be^(2+)` Hence, polarising power decreases as `K^(+) ltCa^(2+) ltMg^(2+) ltBe^(2+)`