L12S07_EConfi 02-12-07

L12S07_EConfi 02-12-07 - CHEM 1A L12: "Electronic...

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Unformatted text preview: CHEM 1A L12: "Electronic Config." Ionization Energies, Shielding Summary Many-e-system One-e Many- - system One- 3 2 1 H (kJ/mol) 328 1312 2372 5248 IE He+ He (1s12) 1) He (1s 2p 6 3 6 4 4 2 3 3 2 2 1 1 IE= IE= Z2 eff n2 R 2004 M.Kubinec 1 1 L10-9 Multi-Electron Atoms, Ions Multi=0 =1 =2 Shielding 4s 3s 2s 1s 4p 3p 2p 3d - + 2p 2s E(3d) > E(4s) 3d) 4s) E(2p) > E(2s) 2p) 2s) 1s L10-10 2004 M. 2004 M.Kubinec Kubinec, A.Pines L12-1 Electron Spin, Magnetism Spin Little Magnet N Quantized Spin Q.M. Classical Q.M. ms=-1/2 "Spin Down" ms=1/2 "Spin Up" S Electron 4 Q.N.s 2001 A.Pines,M.Kubinec, UC n, ? , m? , ms L8-12 2004 M. Kubinec, A.Pines L12-2 Electron Spin, Magnetism Spin Little Magnet N Quantized Spin Q.M. Classical Q.M. ms=-1/2 "Spin Down" Down" ms=1/2 "Spin Up" Up" S Electron 4 Q.N.s 2004 M. Kubinec, A.Pines n, , m , ms L12-3 2001 A.Pines,M.Kubinec,UC Regents 1 CHEM 1A L12: "Electronic Config." Pauli Exclusion Principle No two electrons can have have the same set of Quantum Numbers n, , m , ms Degenerate Orbitals 2004 M. Kubinec, A.Pines Hund's Rule: Fermions vs. Bosons Parallel Spins Lowest Energy L12-4 Electronic Configurations Atom 1s 2s 2p 3s Config. Config. Magnetism H He Li Be B 2004 M. Kubinec, A.Pines 1s1 1s2 1s22s1 1s22s2 1s22s22p1 + 0 + 0 + L12-5 Atom 1s 2s Electronic Configurations 2p 3s Config. Magnetism Config. C N O F Ne Na 2004 M. Kubinec, A.Pines 1s22s22p2 ++ 1s22s22p3 +++ 1s22s22p4 1s22s22p5 1s22s22p6 [Ne]3s1 ++ + 0 + L12-6 2001 A.Pines,M.Kubinec,UC Regents 2 CHEM 1A L12: "Electronic Config." ChemQuiz 12.1 When an electron spin flips, for which of the flips, following is the energy not altered ? 1) N 2004 M. Kubinec, A.Pines 2s 1s 2p 2) O 3) F L12-7 ChemQuiz 12.2 Which species, in its ground state, exhibits state, absorption from n=1 to n=2 ? 1) F 2004 M. Kubinec, A.Pines h 2) F - 3) Na L12-9 ChemQuiz 12.3 For which species does paramagnetism increase upon ionization ? e- 1) C 2004 M. Kubinec, A.Pines 2) N 3) Ne L12-11 2001 A.Pines,M.Kubinec,UC Regents 3 CHEM 1A L12: "Electronic Config." ChemQuiz 12.4 Which species can have the electronic configuration [He]2s22p53s1 ? 1) F - 2) Na 3) Na+ L12-13 + 2004 M. Kubinec, A.Pines Dimitri Ivanovich Mendeleev's Mendeleev' First Rendition of the Periodic Table 2004 M. Kubinec, A.Pines L12-15 Dimitri Ivanovich Mendeleev Professor of Chemistry St. Petersburg University Founder of the Modern Periodic Table (1869) 2004 M. Kubinec, A.Pines L12-16 2001 A.Pines,M.Kubinec,UC Regents 4 CHEM 1A L12: "Electronic Config." Orbital Filling for Elements in the Periodic Table 2004 M. Kubinec, A.Pines L12-17 Orbital Filling for Elements in the Periodic Table 2004 M. Kubinec, A.Pines L12-18 Lecture Complete 2004 M. Kubinec, A.Pines L12-19 2001 A.Pines,M.Kubinec,UC Regents 5 ...
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This note was uploaded on 08/19/2009 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at Berkeley.

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