Friday, June 11, 2004

Aufbau Principle

(from German Aufbauprinzip, “building-up principle”), rationalization of the distribution of electrons among energy levels in the ground (most stable) states of atoms. The principle, formulated by the Danish physicist Niels Bohr about 1920, is an application of the laws of quantum mechanics to the properties of electrons subject to the electric field created by the positive

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