Why are the d and f orbitals in transition metals considered localized?

[Rzbs]

TL;DR

Why are d and f orbitals localized?

Why d and f orbitals in transition metals considered localize?
Is it an experimetal result that d and f orbitals are more near to nuclea than s orbital in transition metals or there is another reason for considering them localized in a solid?

 

[DrDu]

d and f orbitals are orbital in inner shells (n-1 and n-2, respectively), hence they are more localized in the inner of the atoms. The precise size depends also on the filling of the sub-shells. electrons in d- and f- orbitals hardly shield each other from the nuclear charge. Hence, as the filling of the sub-shell increases, the electrons see an increasingly higher effective nuclear charge, which leads to a shrinking of the obitals. Therefore, e.g. the noble metals have relatively low oxidation states and are little reactive in comparison to the earlier elements in the d-block.

 

[Rzbs]

Thanks