Question

What are LANTHANOIDES and ACTINOIDES?

Answer 1

The lanthanide and actinide series make up the inner transition metals.

The lanthanide series includes elements 58 to 71, which fill their 4f sublevel progressively.

The actinides are elements 89 to 103 and fill their 5f sublevel progressively.

Actinides are typical metals and have properties of both the d-block and the f-block elements, but they are also radioactive.

Lanthanides have different chemistry from transition metals because their 4f orbitals are shielded from the atom’s environment.

Answer 2

elements present from atomic no.58 to71 in periodic table are Lanthanide
and the elements present from 90 to103 ar actinides