Q. Identify the incorrect statement among the following:
A) Lanthanoid contraction is the accumulation of successive shrinkages.
B) As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
C) Shielding power of 4f electrons is quite weak.
D) There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
Explanation
[Solution from source] Because of lanthanoid contraction, 4d and 5d elements of the same group have nearly identical radii (e.g. Zr and Hf) and very similar properties. Saying they have no similarities is therefore the incorrect statement; the others are true. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.