102208 - y electron-electron repulsions are now possible...

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Quantum Numbers and What They Mean
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Definitions y State- described by a set of four quantum numbers y Orbital- described by a set of three quantum numbers y Subshell- described by a set of two quantum numbers y Shell- described by a single quantum number
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Definitions y Degenerate States- states with the same energy; within the same subshell y Ground State- the lowest energy state y Excited State- any state other than the ground state y Energy- is determined by the subshell only y Isoelectonic- has the same number of electrons
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Orbital Energy Levels
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Polyelectronic Elements y Z > 1 y The attractive forces between the electrons and the nucleus increase, orbits are closer to the nuclei
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Unformatted text preview: y electron-electron repulsions are now possible Aufbau Principle y Assume the orbitals are similar to H orbits and shapes y Fill the orbitals in order of increasing energy y Write the electron configuration in sushell notation y Draw a box for each orbital y Each orbital (box) can hold 2 electrons, the 2 electrons must have opposite paired spins (Pauli Exclusion Principle) y Within a subshell the electrons are spread out and line up their spins as much as possible (Hunds Rule) Orbital Diagrams y B y C y N y O y F y Ne Filling Orbitals Writing Electron Configurations y S y Cr y Cu y At...
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This note was uploaded on 12/06/2009 for the course CHEM 105A taught by Professor Bau during the Fall '04 term at USC.

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102208 - y electron-electron repulsions are now possible...

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