Hund's Rule — Definition, Formula, Properties & Uses | AllChemicals | AllChemicals

What is Hund's Rule?

Hund's rule states that when filling degenerate orbitals (orbitals of equal energy), electrons occupy each orbital singly with parallel spins before any pairing occurs. This arrangement minimizes electron-electron repulsion and results in the most stable electronic configuration for an atom or ion. Hund's rule is essential for correctly writing electron configurations and explains the magnetic properties of many atoms and molecules.

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Term Hund's Rule

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What is Hund's Rule?

Hund's rule states that when filling degenerate orbitals (orbitals of equal energy), electrons occupy each orbital singly with parallel spins before any pairing occurs. This arrangement minimizes electron-electron repulsion and results in the most stable electronic configuration for an atom or ion. Hund's rule is essential for correctly writing electron configurations and explains the magnetic properties of many atoms and molecules.

More "H" Terms

Haber Process N₂ + 3H₂ ⇌ 2NH₃ | ΔH = −92 kJ/mol Hafnium Hf Half Cell Half Life Half-Cell E = E° − (RT/nF)lnQ Half-Life A(t) = A₀e^(−λt); t½ = ln2/λ Half-Reaction Halide X⁻ (e.g., F⁻, Cl⁻, Br⁻, I⁻) Halogen F₂, Cl₂, Br₂, I₂, At; Group 17; ns²np⁵ valence configuration Halogenation C-X + Cl₂/Br₂ (hv or AlCl₃) → C-X(halogen); EAS or radical pathway Halogens Hard Acid Hard acid: small, highly charged, low polarisability (e.g., H⁺, Mg²⁺, Al³⁺)

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