L10S10+Spin,Pauli+Principle,+Electronic+Configs+02-10-10

L10S10+Spin,Pauli+Principle,+Electronic+Configs+02-10-10 -...

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Unformatted text preview: CHEM 1A L10: "Spin, Pauli Principle, Electronic Configs" Lab 3: Molecules and Light Goal: Determine how effective a Determine sunscreen is at absorbing radiation by measuring the molar absorptivity (extinction coefficient) of the active ingredients. Tools and Skills: : UV-Vis absorption UV-Vis spectroscopy, Beer's Law, and dilution calculations. calculations. © 2006Kubinec, Pines, Nitsche, UCB L10-1 © 2006Kubinec, Pines, Nitsche, UCB L10-2 Electronic Configurations Atom Atom 1s 2s 2p 3s Config. Magnetism H He Li Be B © 2006Kubinec, Pines, Nitsche, UCB 1s1 1s2 1s22s1 1s22s2 1s22s22p1 + 0 + 0 + L10-3 © 2006 Kubinec, Pines, Nitsche, UCB 1 CHEM 1A L10: "Spin, Pauli Principle, Electronic Configs" Atom Atom 1s 2s Electronic Configurations 2p 3s Config. Magnetism C N O F Ne © 2006Kubinec, Pines, Nitsche, UCB 1s22s22p2 1s22s22p3 1s22s22p4 1s22s22p5 1s22s22p6 [Ne]3s1 ++ +++ ++ + 0 + L10-4 Na ChemQuiz© 10.1 When When an electron spin electron flips, for flips, for which of the following following is the energy not not altered ? A) A) N © 2006Kubinec, Pines, Nitsche, UCB last electron is unpaired 2p could be up or down 2s 2s 1s B) O B) C) F C) L10-5 ChemQuiz© 10.2 Which Which species can have the electronic configuration configuration [He]2s22p53s1 ? A) A) F - B) B) Na C) Na+ C) L10-7 © 2006Kubinec, Pines, Nitsche, UCB © 2006 Kubinec, Pines, Nitsche, UCB 2 CHEM 1A L10: "Spin, Pauli Principle, Electronic Configs" Summary Ionization Energy (kJ) 2500 2000 1500 1000 500 0 1s2 2p6 2p 2p4 2p5 2p2 2p3 2p1 1s 2s 2s2 3s C N O F Ne Na L12-8 H He Li Be B © A.Pines,M.Kubinec,UCB Electronegativity Zeff n - > 2.0 2.0 Ionic Na+Cl- - Electronegativity Partly Ionic ~ 0.4-2.0 H +Cl 0.4 Covalent Cl - Cl < 0.4 0.4 + © 2006Kubinec, Pines, Nitsche, UCB Na ~0.9 H ~ 2.2 Cl ~ 3.2 © A.Pines,M.Kubinec,UCB L12-10 L10-9 Dimitri Dimitri Ivanovich Mendeleev’s Mendeleev’s First First Rendition of the the Periodic Table © 2006Kubinec, Pines, Nitsche, UCB L10-10 © 2006Kubinec, Pines, Nitsche, UCB Dimitri Dimitri Ivanovich Mendeleev Mendeleev Professor Professor of Chemistry St. St. Petersburg University Founder Founder of the Modern Periodic Periodic Table (1869) L10-11 © 2006 Kubinec, Pines, Nitsche, UCB 3 CHEM 1A L10: "Spin, Pauli Principle, Electronic Configs" Orbital Filling for Elements in the Periodic Table © 2006Kubinec, Pines, Nitsche, UCB L10-12 Names for Groups in the Periodic Table © 2006Kubinec, Pines, Nitsche, UCB L10-13 Names Names for Groups in the Periodic Table (cont’d) (cont’d) © 2006Kubinec, Pines, Nitsche, UCB L10-14 © 2006 Kubinec, Pines, Nitsche, UCB 4 CHEM 1A L10: "Spin, Pauli Principle, Electronic Configs" © 2006Kubinec, Pines, Nitsche, UCB L10-15 Periodic Table Recommended by International Union of Pure and Applied Chemistry Chemistry (IUPAC) © 2006Kubinec, Pines, Nitsche, UCB L10-16 Ionization Energy, Electron Affinity X X + eM IE (kJ EA (kJ mol-1) mol-1) X+ + e- IE X- EA Na 496 -53 e- K 419 -48 Rb Rb 403 -47 X IE (kJ EA (kJ mol-1) mol-1) Cl 1251 -349 Br 1140 -325 I 1008 -295 © 2006Kubinec, Pines, Nitsche, UCB L10-17 © 2006 Kubinec, Pines, Nitsche, UCB 5 CHEM 1A L10: "Spin, Pauli Principle, Electronic Configs" Alkali Metals in Water 2 M(s) + 2 H2O Redox Reaction 2M 2M +2e + - H2 + 2 MOH 2 H20 + 2 e- H2 + 2 O H - © 2006Kubinec, Pines, Nitsche, UCB L10-18 Lecture Complete © 2006Kubinec, Pines, Nitsche, UCB L10-19 © 2006 Kubinec, Pines, Nitsche, UCB 6 ...
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