econfig - Atomic Structure : Electron Configurations...

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Atomic Structure : Electron Configurations Electron Configuration - Describes the distribution of electrons in atomic orbitals according to specific rules. Electron Diagram - Illustrates the distribution of electrons in atomic orbitals according to specific rules. Aufbau Principle Electrons are added one at a time, starting with the lowest energy orbital until all the electrons have been accounted for. Relative Energies of Atomic Orbitals Wolfgang Pauli Pauli Exclusion Principle An orbital can hold a maximum of 2 electrons . 2 electrons in the same orbital must have opposite spins . An electron is "paired" if it is sharing an orbital with another electron with an opposite spin. An electron is "unpaired" if it is alone in an orbital A H atom has one electron which is unpaired in the lowest energy orbital , 1s . H: 1s 1 A He atom has two electrons; the second one fills the 1s orbital with a spin opposite that of the first electron. These two electrons are now paired.
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He: 1s 2 A Li atom has 3 electrons; the third one is added to the next lowest energy orbital , 2s and is unpaired. Li: 1s
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This note was uploaded on 07/15/2009 for the course CHE 131 taught by Professor Kerber during the Fall '08 term at SUNY Stony Brook.

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econfig - Atomic Structure : Electron Configurations...

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