CHEM 201 - 9.28.07

CHEM 201 - 9.28.07 - CHEM 201 September 28, 2007 Electron...

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CHEM 201 – September 28, 2007 Electron Shielding - Z eff is the net nuclear charge “felt” by an electron o Total number of electrons minus number closer to the nucleus than it o Less than z o Increases toward the nucleus Anomalous Electron Configurations o Result of an unusual stability of half filled and fully filled subshells o Chromium – should be [Ar] 4s 2 3d 4 but is [Ar] 4s 1 3d 5 because it is more stable with both levels half-filled o Copper – should be [Ar] 4s 2 3d 9 but actually is [Ar] 4s 1 3d 10 o Nb – [Kr] 5s 2 4d 3 but is [Kr] 5s 1 4d 4 o Mo – [Kr] 5s 1 4d 5 o Ru – [Kr] 5s 1 4d 7 o Rh o Pd o Ag
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CHEM 201 - 9.28.07 - CHEM 201 September 28, 2007 Electron...

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