20080328 Molec 4 - Intro Chemistry II 030.102 - Chapter 15...

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Intro Chemistry II – 030.102 - Chapter 15 Spring, 2007 1 Homonuclear Diatomic Molecules: Second-Period Atoms Correlation diagram B 2 O 2 Heteronuclear Diatomic Molecules ! 2 s = C A " 2 s A + C B 2 s B 2 s * = C A ' 2 s A C B ' 2 s B MO’s from 2 s atomic orbitals C B > C A , C A ' > C B ' Atom A assumed to be more electronegative than atom B Diagram for BO molecule
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Spring, 2007 2 Heteronuclear Diatomic Molecules HF molecule Orbital has more amplitude on F, HF dipole moment H ! + F 16.3. Molecular Orbitals in Polyatomic Molecules: Valence Bond Model Valence bond model grew out of qualitative Lewis electron pair model. VB model yields MO’s localized between pairs of atoms. Electrons placed in these orbitals or in lone-pair orbitals on a given atoms. Simple application of VB model to H 2 O The problem is that it would appear that the H 2 O bond angle should be close to 90 ° , while experimentally it is ~105 ° . and not 4, as it is in methane.
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20080328 Molec 4 - Intro Chemistry II 030.102 - Chapter 15...

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