What is the Aufbau Principle?
The Aufbau principle dictates the manner in which electrons are filled in the atomic orbitals of an atom in its ground state.
It states that electrons are filled into atomic orbitals in the increasing order of orbital energy level. According to the Aufbau principle, the available atomic orbitals with the lowest energy levels are occupied before those with higher energy levels.
|Aufbau Principle - Detailed Explanation. Diagram, Exceptions
Salient Features of the Aufbau Principle
|The energy gap between the different subshells