Chem HW #13 - Feedback: Electrons fill energy levels in the...

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Electrons fill energy levels in the order: ....... 1s, 2s, 2p, 3s, 3p, 4s, 3d Lowest levels fill first. Note that the 4s orbital fills before the 3d. ....... ..... .. ...... ... ....... ....... ......... ..... .. ....... ....... ....... ....... ....... 3d 4s ..... .. 3p 3s ..... .. 2p 2s ..... .. ..... .. ..... .. 1s Feedback: Each line in an orbital energy diagram represents an orbital. This diagram is filled out based upon 3 principles: "Filling up" or Aufbau Principle Electrons go into the lowest energy orbitals first. Pauli Principle A maximum of 2 electrons can occupy an orbital. When 2 electrons occupy the same orbital, they must have paired spins, (or "ud" using our notation). Hund's Rule When filling p or d orbitals with the same energy, electrons go into separate orbitals with parallel spins until all of the orbitals are occupied by one electron. Then they are paired. S
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This note was uploaded on 09/22/2010 for the course CHEM 3 taught by Professor Pedersen during the Fall '08 term at University of California, Berkeley.

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Chem HW #13 - Feedback: Electrons fill energy levels in the...

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