Lecture 19 10102008 - Electron Configuration of...

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Electron Configuration of Multielectron Atoms Aufbau Principle: Lowest energy orbitals fill first Orbitals only hold two electrons and each should have different spin Hund’s Rule: Degenerate (same energy level) orbitals are filled with electron until all are half filled before pairing of electrons occurs 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p [He] [Ne] [Ar] [Kr] [Xe] [Rn] Core
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Orbital Energy Levels for Hydrogen and Multielectron Atoms Each electron in an atom occupies an orbital and each orbital has a specific energy level
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Electron Configuration of Atoms Li ↑↓ 1 s 2 2 s 1 1 s 2 s Be ↑↓ ↑↓ 1 s 2 2 s 2 1s 2 s B ↑↓ ↑↓ 1 s 2 2 s 2 2 p 1 1 s 2 s 2 p x 2 p y 2 p z C ↑↓ ↑↓ 1 s 2 2 s 2 2 p 2 1 s 2 s 2 p x 2 p y 2 p z
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Electron Configuration of Atoms N ↑↓ ↑↓ 1 s 2 2 s 2 2 p 3 1 s 2 s 2 p x 2 p y 2 p z O ↑↓ ↑↓ ↑↓ 1 s 2 2 s 2 2 p 4 1 s 2 s 2 p x 2 p y 2 p z Ne ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ 1 s 2 2 s 2 2 p 6 1 s 2 s 2 p x 2 p y 2 p
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