The d-and f-Block Elements Class 12 Notes – Chapter 8
The middle layer of the periodic table is filled with d block elements. The inner d orbits of group 3 to group 13 are filled progressively. On the other hand, f block elements are found outside at the bottom of the periodic table. In these elements, 5f and 4f orbitals are filled progressively. Three series of transition elements are recognized by the filling of 3d, 4d, 5d orbitals. Please refer The d and f Block Elements Class 12 Notes for more revision notes.
CBSE Revision Notes 