6.5 Electronic Configurations
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Ground State Electron Configurations
| Rules for Ground State Electron Configurations | |
|---|---|
| Aufbau Principle | Electrons fill orbitals in order of increasing energy. |
| Hund’s Rule | Degenerate orbitals each get an electron before pairing. |
| Pauli Exclusion Principle | No 2 electrons in an atom have the same 4 quantum numbers. |
Standard and Noble Gas Configurations
Common Exceptions (Cr, Mo and Cu, Ag, Au)
Ions (transition metals too)
Number of valence electrons
Ground State vs. Excited State