2.2.3: Aufbau Principle - Chemistry LibreTexts
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WEBJan 31, 2024 · The Aufbau Principle (also called the building-up principle or the Aufbau rule) states that, in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy level before occupying higher-energy levels. In general, an electron will occupy an atomic orbital with the lowest value of \(n, l, m_l\), in that order ...
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