Question

If ionic radii of K+ and F— are about 1.34A0 each, then the expected values of atomic radii of K and F should be

respectively.

(a) 2.31 and .64 A0

(b) 2.31 and 1.34 A0

(c ) .64 and 2.31 A0

(d) 1.34 and 1.34A0​

Answer 1

If ionic radii of K+ and F— are about 1.34A0 each, then the expected values of atomic radii of K and F should be (a) 2.31 and .64 A0

Explanation:

1.If the ionic radii of K+and F −are about 1.34  A˚each, then the expected values of atomic radii of K and F should be 2.31 and 0.64  A˚ respectively.

2.Cations are always shorter than their parent atom, anions are always larger.Thus radii of  K +  will be more than 1.34 and that of  F −  will be less than 1.34.