Question

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.

Answer 1

Explanation:

the incorrect statement is shielding power of 4f electrons is quite weak so it is incorrect

so the answer is C