06 - Chemistry 1000 Lecture 6 Multielectron atoms Marc R...

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Unformatted text preview: Chemistry 1000 Lecture 6: Multielectron atoms Marc R. Roussel Spin I Spin (with associated quantum number s ) is a type of angular momentum attached to a particle. I Every particle of the same kind (e.g. every electron) has the same value of s . I Two types of particles: Fermions: s is a half integer Examples: electrons, protons, neutrons ( s = 1 2 ) Bosons: s is an integer Example: photons ( s = 1) Spin magnetic quantum number I All types of angular momentum obey similar rules. I There is a spin magnetic quantum number m s which gives the z component of the spin angular momentum vector: S z = m s ~ I The value of m s can be- s ,- s + 1 ,..., s . I For electrons, s = 1 2 so m s can only take the values- 1 2 or 1 2 . Pauli exclusion principle No two fermions can share a set of quantum numbers. Multielectron atoms I Electrons occupy orbitals similar (in shape and angular momentum) to those of hydrogen. I Same orbital names used, e.g. 1s, 2p x , etc. I The number of orbitals of each type is still set by the number of possible values of m ‘ , so e.g. there are three 2p orbitals., so e....
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This note was uploaded on 03/03/2012 for the course CHEM 1000 taught by Professor Marc during the Fall '06 term at Lethbridge College.

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06 - Chemistry 1000 Lecture 6 Multielectron atoms Marc R...

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