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Definition of Hund's rule

Hund's rule Definition from Science & Technology Dictionaries & Glossaries
General Chemistry Glossary
A rule of thumb stating that subshells fill so that the number of unpaired spins is maximized, or "spread them out and line them up."
Hund's rule Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
Hund's rule of maximum multiplicity is a rule based on observation of atomic spectra, which is used to predict the ground state of an atom or molecule with one or more open electronic shells. The rule states that for a given electron configuration, the lowest energy term is the one with the greatest value of spin multiplicity. This implies that if two or more orbitals of equal energy are available, electrons will occupy them singly before filling them in pairs. The rule, discovered by Friedrich Hund in 1925, is of important use in atomic chemistry, spectroscopy, and quantum chemistry, and is often abbreviated to Hund's rule, ignoring Hund's other two rules.

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