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CH8(5-7)Nov3FA08a - CHEM 109 General Chemistry University...

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CHEM 109 General Chemistry University of Nebraska FALL 2008  3 November 2008
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Electron Configurations Types of Configurations Normal (following the aufbau filling patterns) _____________ Filling Patterns Configurations of _______ Configurations of ____________________ Configurations of _____________
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The reason 4s is filled before 3d is because of the crossover in sublevel energies
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Partial orbital diagrams and electron configurations for the elements in Period 4 .
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Anomalous Filling Patterns
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Anomalous filling patterns of Cr & Mo (s 1 d 5 ) and of Cu & Ag (s 1 d 10 ) lead us to conclude that half-filled and filled sublevels are ____________ ____________ . Cr: 1s 2 2s 2 2p 6 3s 2 3p 6 __________ Mo: 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 _________ Cu: 1s 2 2s 2 2p 6 3s 2 3p 6 ___________ Ag: 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4s 2 4p 6 _____________ Anomalous Filling Patterns
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Electron Configurations of Ions _______: electrons are removed from the orbital with the _____ principle quantum number, n , first: Li (1 s 2 2 s 1 ) [Li] + (1 s 2 ) In transition metal cations, the (n-1)d orbitals are always more ________ than the ns orbitals Fe ([Ar]3 d 6 4 s 2 ) [Fe] 2+ ([Ar]3 d 6 ) Fe ([Ar]3 d 6 4 s 2 ) [Fe] 3+ ([Ar]3 d 5 ) _______: electrons are added to the orbital with _______ n : F (1 s 2 2 s 2 2 p 5 ) [F] (1 s 2 2 s 2 2 p 6 )
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The reason 4s electrons are removed before 3d electrons is the Period 4 ___________________________ Crossover energies are due to increasing nuclear charge and shielding of 4s by 3d orbitals.
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