Identify the wrong statement among the following

As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with 5d series of elements

The correct answer is (4) As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with 5d series of elements.

The properties of the 4d and 5d series of elements do have similarities, despite the lanthanide contraction. This is because the lanthanide contraction is not large enough to completely mask the underlying trends in the periodic table.

The other statements are correct.

Statement (1): The shielding power of 4f electrons is weak because the 4f orbitals are buried deep inside the atom. This means that they do not effectively shield the outer electrons from the nuclear charge.

Statement (2): There is a decrease in the radii of the atoms or ions while proceeding from La to Lu. This is because the lanthanide contraction causes the nuclear charge to increase as the atomic number increases.

Statement (3): Lanthanoid contraction is the accumulation of successive shrinkages. This means that the decrease in the radii of the atoms or ions is not a sudden change, but rather a gradual process that occurs over the entire lanthanide series.

Therefore, the answer is (4). The properties of the 4d and 5d series of elements do have similarities, despite the lanthanide contraction.