Electron Configurations

Valence Electrons

• Valence Electrons (ve-) are electrons in the atom's highest outermost orbital.
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Quantum Numbers

• Principle Quantum Number/Principle Energy Levels (n) indicates the relative size and energies of atomic orbitals.
• As the n increase, the orbital becomes larger
• Are the major energy levels of an atom
• "Floor Level"
• Energy Sublevels / Subshell are the energy levels contained within principle energy level. "Room Type"
• Atomic Orbital is a three-dimensional region around the nucleus of an atom that describes the electron's probable location. "Bunk Bed"

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Ground State Electron Configurations

• The arrangement of electrons in an atom is called the atom's electron configuration.
• " Manager Code"
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Rules of Electron Configuration

• Aufbau Principle states that each electron occupies the lowest energy orbital available. "Lazy Electrons"
• All orbitals related to an energy sublevel are of equal energy.
• The energy sublevels within a principle energy level have different energies such as 2p is higher in energy than 2s.
• The sequence of energy sublevels within an energy level is s, p, d, f.
• Orbitals related to energy sublevels within one energy level can overlap orbitals related to energy sublevels within another principal energy level.

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Rules of Electron Configuration

• Hund's Rule states that single electrons with the same spin must occupy each equal energy orbital before additional electrons wth oppostite spins can occupy the same orbital.
• "Each wants a bunk bed for themselves before doubling up".
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Rules for Electron Configurations

• Pauli Exculusion Principal states that a maximum of two electrons may occpy a single atomic orbital but only if the electrons have oppostite spins.
• Clockwise and counterclockwise
• "Pauli wants 2 crackers"
• "Bunk Beds each hold 2 with pillows on opposite ends".

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Stable Electron Configuration

• Order of stability from most to least stable.
• Full enrgy levels (floor).
• Full subleves (room).
• Half full sublevels (room).