Identify the incorrect statement among the following:

Options

A. As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
B. Shielding power of 4d electrons is quite weak
C. There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
D. Lanthanoid contraction is the accumulation of successive shrinkages

Answer

A

Explanation

Elements of 4f series and 5d series show similarities in properties because the size of elements of 4d series are almost similar to those of 5d series on account of lanthanoid contraction which is due to the greater effect of the increased nuclear charge than of screening effect (shielding effect).