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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
Wikipedia English - The Free Encyclopedia
Hund's rule of maximum multiplicity is an observational rule which states that a greater total spin state usually makes the resulting atom more stable. Accordingly, it can be taken 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. As a result this rule is often abbreviated to Hund's rule, ignoring Hund's other two rules.

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