The radius of `La^(3+)` (At No. of La = 57) is 1.06Å. Which one of the following given value will be closest to the radius fo `Lu^(3+)` (Atomcic NO. of Lu = 71) ?

Options

A. `1*40Å`
B. `1*06Å`
C. `0*85Å`
D. `1*60Å`

Answer

C

Explanation

Due to lanthanoid contraction, the ionic radii of lanthanoids decreases from `La^(3+)` to `Lu^(3+)`. Therefore, the lowest value (0.85 Å) is the ionic radius of `Lu^(3+)`