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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-08-15 and was most recently seen on 2026-08-15.
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 in a subshell of an atom, electrons are first singly filled with same spin before they are filled doubly. 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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