Question

The radius of La³⁺ (Atomic number of La = 57) is 1.06 Å. Which one of the following given values will be closest to the radius of Lu³⁺ (Atomic number of Lu = 71)?

Options

• 1.60 Å

• 1.40 Å

• 1.06 Å

• 0.85 Å

Answer 1

0.85 Å

Explanation:

Due to lanthanoid contraction, the radius of Lu³⁺ is smaller than that of La³⁺. Hence, the closest value is 0.85 Å.