Download - Chem 115 electron configuration
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Electron configurationReported by Marvin B. Gonzaga
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Atomic orbitals
• Since an electron moves so fast, it shows wavelike properties.• The electron is most likely to be found
where its wave intensity was greatest and least likely to be found where its wave intensity was smallest.
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OrbitalsSpecifies a volume of space where the electron is most likely to be found
Atomic orbitals
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Electron Configuration
• How electrons are distributed in an atom.• Designation of the
most probable distribution of electrons.
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3 Principles in Electron Configuration
• Pauli Exclusion Principle• Aufbau Principle•Hund’s Rule
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Pauli Exclusion Principle
• A maximum of 2 electrons may occupy an orbital, and these 2 electrons must have opposite spins
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Aufbau Principle
• German for “build up”
• Electrons fill orbitals starting at the lowest available energy state before filling higher states.
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Electron Distribution Mnemonics
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Hund’s Rule• Every orbital in a
sublevel is singly occupied before any orbital is doubly occupied.
• All of the electrons in singly occupied orbitals have the same spin (to maximize total spin).
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Example
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