Question

Lanthanum is grouped with f-block elements because
(a) it has partially filled f-orbitals
(b) it is just before Ce in the periodic table
(c) it has both partially filled f and d-orbitals
(d) properties of lanthanum are very similar to the elements of f-block

Answer 1

it has paritially filled f-orbitals

Answer 2

it's b option hope it will help you