Identify the incorrect statement among the following:

Options

A. Lanthanoids contraction is the accumulation of successive linkages.
B. as a result of lanthanoids contraction the properties of `4d` series of the transition elements have no similarities with the `5d` series of transition elements.
C. shielding power of `4f` electrons is quite weak
D. there is a decreases in the radii of the atoms or ions as one proceeds from `La` to `Lu`

Answer

B

Explanation

In each vertical column of transition element, the elemints of second and third transition series resemble each other more colsely than the elements of first and second transition series on account of lanthanoids contraction. Hence, the properties of elements resemble with the properties of the elements of `5d` of the transition elements.