Lecture 9 - Chem 4A F2008 Lecture 09: Periodic Trends IE EA...

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Unformatted text preview: Chem 4A F2008 Lecture 09: Periodic Trends IE EA 9/15/2008 Ionization Energy, Electron Affinity X X + eM (kJ) (kJ) (kJ) (kJ) X+ + e- IE X- EA Na 496 53 e- K 419 48 Rb 403 47 X (kJ) (kJ) (kJ) (kJ) Cl 1251 349 Br 1140 325 I 1008 295 IE IE EA EA © 2008 A. Pines M. Kubinec L9-1 Alkali Metals in Water 2 M(s) + 2 H2O (s) Redox Reaction 2M 2 M+ + 2 e2 H20 + 2 e© 2008 A. Pines M. Kubinec H2 + 2 MOH H2 + 2 OHL9-2 ChemQuiz© 9.1 © 2008 A. Pines M. Kubinec L9-3 © 200 A. Pines M. Kubinec 1 Chem 4A F2008 Lecture 09: Periodic Trends IE EA 9/15/2008 Ionic Bonding (Electron Transfer) (Electron Coulomb Attraction e- + + - - Li. + :Cl. Li + : Cl: + :: :: :: Na. + : Cl. © 2008 A. Pines M. Kubinec Ionic vs Covalent Bonding E(R) kJ +147 0 Na+ClR nm 0.3 0.5 1.0 1.5 L9-5 : :: :::: Na + :Cl : - L9-4 Na+ + ClNa + Cl Ionic Covalent -435 0 © 2008 A. Pines M. Kubinec ChemQuiz 9.2 © 2008 A. Pines M. Kubinec L9-6 © 200 A. Pines M. Kubinec 2 Chem 4A F2008 Lecture 09: Periodic Trends IE EA 9/15/2008 Atom Config IE 1s1 1s2 1s22s1 1s22s2 Atomic Properties EA(kJ) EA( 73 Atom Config 1s22s22p2 IE 1086 EA(kJ) EA( 122 H He Li Be B 1312 C N O F Ne Na 2372 >0 1s22s22p3 1402 ~0 520 60 1s22s22p4 1314 141 899 >0 1s22s22p5 1681 328 1s22s22p1 801 27 1s22s22p6 2081 ~0 © 2008 A. Pines M. Kubinec [Ne]3s1 496 53 L9-7 Trend in Ionization Energy 2500 Ionization Energy (kJ) 1s2 2p6 2p 2p4 2p5 2p3 2000 1500 1000 500 0 H He Li Be B C N O F Ne Na L9-8 1s1 2s1 2s2 2p2 2p1 3s1 © 2008 A. Pines M. Kubinec ChemQuiz© 9.3 © 2008 A. Pines M. Kubinec L9-9 © 200 A. Pines M. Kubinec 3 Chem 4A F2008 Lecture 09: Periodic Trends IE EA 9/15/2008 ChemQuiz© 9.4 © 2008 A. Pines M. Kubinec L9-10 Electronegativity Zeff n - ∆ > 2.0 Ionic Na+Cl- Electronegativity Partly Ionic ∆ ~ 0.4-2.0 Hδ+Clδ0.4Covalent Cl - Cl ∆ < 0.4 + Na ~0.9 H ~ 2.2 Cl ~ 3.2 © 2008 A. Pines M. Kubinec L9-11 Exothermic Reaction H2 + X2 H H X X 2HX H H X X © 2008 A. Pines M. Kubinec L9-12 © 200 A. Pines M. Kubinec 4 ...
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This note was uploaded on 10/19/2009 for the course CHEM 4a taught by Professor Gordon during the Spring '06 term at University of California, Berkeley.

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