Identify the incorrect statement among the following:
There is a decrease in the radii of the atoms or ions as one proceeds from to .
Lanthanoid contraction is the accumulation of successive shrinkages.
As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
Shielding power of 4f electrons is quite weak.
The statement 'As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements' is incorrect. In fact, due to lanthanoid contraction, the atomic radii of the elements of the second (4d) and third (5d) transition series are virtually the same (e.g., and ). Because of this similarity in size, they exhibit very similar physical and chemical properties and often occur together in nature, making their separation difficult.
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