Who are the members of the lanthantides and acitides family?

Answer 1

The lanthanides, also known as the lanthanoids, consist of 15 elements from lanthanum (La, atomic number 57) to lutetium (Lu, atomic number 71). The actinides, or actinoids, include 15 elements from actinium (Ac, atomic number 89) to lawrencium (Lr, atomic number 103). Both families are part of the f-block in the Periodic Table and are characterized by the filling of f-orbitals. They are known for their unique properties, including high atomic and ionic sizes, as well as distinct magnetic and catalytic behaviors.