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1372 Lec 11OCT2011 - 1 General Chemistry 4th edition Hill...

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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 1
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 2
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 3 Valence Bond Theory Valence Bond ( VB ) theory states that a covalent bond is formed when atomic orbitals (AOs) overlap. In the overlap region, electrons with opposing spins produce a high electron charge density. In general, the more extensive the overlap between two orbitals, the stronger is the bond between two atoms. Overlap region between nuclei has high electron density
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 4 Bonding in H 2 S The hydrogen atoms’ s orbitals can overlap with the two half- filled p orbitals on sulfur. The measured bond angle in H 2 S is 92°; good agreement.
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 5 Important Points of VB Theory Most of the electrons in a molecule remain in the same orbital locations that they occupied in the separated atoms. Bonding electrons are localized in the region of AO overlap. For AOs with directional lobes (such as p orbitals), maximum overlap occurs when the AOs overlap end to end . VB theory is not without its problems …
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General Chemistry 4 th edition, Hill, Petrucci, McCreary, Perry 6 Hybridization of Atomic Orbitals
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