Question

The incorrect statement among the following is: 

Options

• d-block elements show irregular and erratic chemical properties.

• La and Cu have partially filled d-orbitals and no other partially filled orbitals.

• The chemistry of various lanthanoids is very similar

• 4f and 5f orbitals are equally shielded

Answer 1

4f and 5f orbitals are equally shielded.

Explanation:

The shielding of 5f-electrons is less effective than that of 4f-electrons.