Lanthanide and Actinide contraction refers to

Options

A. Atomic radii
B. Atomic as well as `M^(3+)` radii
C. Valence electrons
D. Oxidation states

Answer

B

Explanation

The lanthanide contraction relates to atomic as well as `M^(3+)` radii in which the regular decrease in the size of lanthanoid ion from `La^(3+) " to " Lu^(3+)` are found.