= Aufbau principle
{wiki=Aufbau_principle}
The Aufbau principle is a fundamental concept in quantum chemistry and atomic physics that describes the process by which electrons populate atomic orbitals in a particular order. According to this principle, electrons fill atomic orbitals starting from the lowest energy level and move to higher energy levels only after the lower ones are filled. The general guideline for this filling order is summarized by the "n + l" rule, where "n" is the principal quantum number and "l" is the azimuthal quantum number.
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