The correct order of atomic radii is

The lanthanide contraction relates to

Write a reaction with lanthanoids $(Ln)$:

The outer electronic structure of lawrencium (atomic number $103$) is

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: $5f$ electrons can participate in bonding to a far greater extent than $4f$ electrons.
Reason $R$: $5f$ orbitals are not as buried as $4f$ orbitals.
In the light of the above statements,choose the correct answer from the options given below:

Select the incorrect statement about lanthanides.