Aufbau ’s Principle , Hund’s Rule, and Pauli’s Exclusion Principle are rules for writing electron configurations, so go over the main principles of electron configurations if you need to before we start discussing them. Aufbau ’s Principle Aufbau (German aufbauen, “to build up”) principle tells us that electrons fill the orbitals in the order of increasing their energy level. Remember, the main energy level is given by the principal quantum number, n, and it increases down the ... The Aufbau principle is a crucial chemistry principle for determining an atom’s electron configuration in its ground state. The Aufbau principle requires the atom to adhere to Pauli’s exclusion principle and Hund’s rule, which states that each orbital can initially only hold one electron before becoming doubly occupied (no two electrons in one orbital have same spin). Aufbau principle states that an electron occupies an orbital in the order of lowest to highest energy orbital. ' Aufbau ' is a german word that means construction or build up. This is the reason, it is also called a building-up principle or construction principle . Electronic Configuration of Sulphur and Nitrogen - Aufbau Principle Diagram and Features According to the Aufbau Principle , electrons are filled in order of increasing energies in their ground state. The atomic orbital with the lowest energy level occupies first, compared to higher energy levels.
