Filling of Orbitals: Aufbau Principle, Pauli Exclusion Principle & Hund's Rule | Class 11 Chemistry NEET Notes
Filling of Orbitals Class 11 Notes | Aufbau, Pauli & Hund's Rule Filling of Orbitals in an Atom (Aufbau Principle) – Easy NEET Notes Easy infographic explaining Aufbau Principle, Pauli Exclusion Principle and Hund's Rule for Class 11 Chemistry and NEET preparation. - Dr.Sanjaykumar Pawar Filling of Orbitals Electrons enter orbitals in a fixed order. This process is called filling of orbitals . The order depends on the energy of orbitals . Lower energy orbitals are filled first , then higher energy orbitals. The filling follows three important rules: Aufbau Principle Pauli Exclusion Principle Hund's Rule of Maximum Multiplicity Aufbau Principle Meaning of Aufbau The German word "Aufbau" means "building up" . It means electrons build the electronic configuration step by step. Definition Electrons first occupy the lowest energy orbital available. Only after lower energy orbitals are completely filled do electrons move to highe...