BRAINCAKEPredicting Electronic Configuration
Pauli Exclusion Principle and Hund's Rule
The Pauli exclusion principle states that two electrons may occupy the same orbital only if they have opposite spins.
Hund's rule states that electrons occupy orbitals of the same energy singly before pairing.
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Key terms in this lesson
- orbital
- A region around a nucleus that can hold up to two electrons of opposite spin.
More in Atomic Structure
- Relative Molecular Mass from a Mass Spectrometer
- Quantum Shells
- Orbitals
- Electronic Configurations
- Energy Levels and Emission Spectra
- First Ionisation Energy
- Successive Ionisation Energies
- The Energy of an Electron
All 19 lessons in Atomic Structure · All Edexcel AS-level Chemistry topics