In context of the lanthanoids, which of the following statements is not correct?

Options

A. There is a gradual decrease in the radii of the members with increasing atomic number in the series
B. All the member exhibit +3 oxidation state
C. Because of similar properties the separation of lanthanoids is not easy
D. Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series

Answer

D

Explanation

Availability of f4 electrons do not results in the formation of compounds in +4 state for all the members of the series.