Unformatted text preview: • The Pauli exclusion principle (Wolfgang Pauli, 1925) states that no two electrons in an atom can have the same set of four quantum numbers ( n, l, m l and m s ) • For a given orbital (e.g. 2 p z ) the values of n , l and m l are fixed . Thus, if we want to put more than one electron into an orbital we must assign unique values to the magnetic spin ( m s quantum number) • the m s quantum number can only have two values (+1/2, and 1/2) therefore, only two electrons at most can occupy the same orbital, and they have opposite values for magnetic spin What are the consequences of magnetic spin quantum number and the Pauli exclusion principle? • If we know the number of electrons in an atom we can assign probable quantum numbers and know something about their orbital shapes • Provides an understanding for the periodic nature of the elements...
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 Fall '10
 LauraChoudry
 Chemistry, Electron, Pauli exclusion principle, Wolfgang Pauli, electron spin quantum

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