I suppose an example of a violation of this principle would be filling the 3d sublevel before the 4s sublevel because the 3d sublevel only becomes lower in energy once electrons are put into it. It states that we must fill the orbitals of lower energy shells first.
The Aufbau principle essentially combines the Pauli Exclusion Principle and Hund's Rule and described the way you "build up" electrons in atoms. A violation of this would be putting two electrons in one orbital before one is placed in each or placing one electron in each orbital that do not have the same spin.
Hund's Rule states that one electron must be placed in each orbital of the same sublevel before the electron's are paired, and each of the electrons placed initially in each orbital must be of parallel spin. It states that a maximum of two electrons are put into orbitals in the order of increasing orbital energy: the lowest-energy orbitals are filled before electrons are placed in higher-energy orbitals. Examples of rule violations would be putting more than two electrons in an orbital or putting two electrons in an orbital that have the same spin. 35 violating the Aufbau principle (5) split in the canonical ROHF method into two respective pairs of orbital energies, (3d and 3d) and (4s and. The IUPAC defines the aufbau principle as: A rule for building up the electronic configuration of atoms and molecules. In other words, no two electrons can have the same four quantum numbers. It also states that if there are two electrons in an orbital, they must have opposite spin. This video explains Aufbaus Principle, Paulis Exclusion Principle, and Hunds Rule, and violations of each are provided to better explain each rule. The Pauli Exclusion Principle states that each orbital can have two electrons maximum. In part because the energy levels are so close and tend to overlap so that the orbital that should be filled according to the Aufbau principle is actually a.
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