Hello Aspirant,

The f block elements/inner transitionary elements of the periodic table are further classified into two namely Lanthanoids and Actinoids. Lanthanoids have atomic numbers from 57 to 71.And Actinoids are from 89 to 103.

Lanthanoids

Lanthanum

Cerium

Praseodymium

Neodymium

Promethium

Samarium

Europium

Gadolinium

Terbium

Dysprosium

Holmium

Erbium

Thulium

Ytterbium

Lutetium

Actinoids

Actinium

Thorium

Protactinium

Uranium

Neptunium

Plutonium

Americium

Curium

Berkelium

Californium

Einstenium

Fermium

Mendelivium

Nobelium

Lawrencium