Identify the incorrect statement among the following.

Options

A. 4f and 5f orbitals are equally shielded.
B. d-Block elements show irregular and erratic chemical properties among themselves.
C. La and Lu have partially filled d-orbitals and no other partially filled orbitals.
D. The chemistry of various lanthanoids is very similar.

Answer

A

Explanation

The decrease in the force of attraction exerted by the nucleus on the valence electrons due to presence of electrons in the inner shells is called shielding effect. A 4f orbital is nearer to the nucleus than 5f orbital. Hence shielding of 4f is more than 5f.