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.
    electron configurations

    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