Lec18_11_drobny - Lecture 18: The Aufbau Principle Reading:...

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Unformatted text preview: Lecture 18: The Aufbau Principle Reading: Zumdahl 12.11-12.13 Recommended Problems:12.63, 12.65, 12.67, 12.69, 12.75 Outline: Spin The Aufbau Principle Filling up orbitals and the Periodic Table Spin Further experiments demonstrated the need for one more quantum number. Specically, some particles (electrons in particular) demonstrated inherent angular momentum. Spin (cont.) The new quantum number is m s (analagous to m l ). For the electron, m s has two values: +1/2 and -1/2 m s = 1/2 m s = -1/2 Pauli Exclusion Principle Defn : No two electrons may occupy the same quantum state simultaneously . In other words: electrons are very territorial. They dont like other electrons horning in. In practice, this means that only two electrons may occupy a given orbital, and they must have opposite spin. The Aufbau Principal For polyelectronic atoms, a direct solution of the Schrodinger Eq. is not possible. When we construct polyelectronic atoms, we use the hydrogen-atom orbital nomenclature to discuss in which orbitals the electrons reside. This is an approximation (and it is surprising how well it actually works). The Aufbau Principal (cont.) When placing electrons into orbitals in the construction of polyelectronic atoms, we use the Aufbau Principle....
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This note was uploaded on 01/18/2012 for the course CHEM 152A taught by Professor Chiu during the Fall '12 term at University of Washington.

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Lec18_11_drobny - Lecture 18: The Aufbau Principle Reading:...

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