C1403.2006.Week_Nine

C1403.2006.Week_Nine - The Nature of the Chemical Bond The...

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The Nature of the Chemical Bond
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The Nature of the Chemical Bond 1937 studies lead to discovery of α -helix structure of proteins 1916 Lewis: electron pair model 1919-1920 Langmuir: chemical bonding and valence theory
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The Nature of the Chemical Bond X-ray pattern of DNA double helix R. Franklin F. Crick J. Watson M. Wilkins 1953 discovery of the helix structure of double stranded DNA
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Bonding Theories • Valence Bond Theory – Molecules are constructed by electrons in valence shells pairing up as atoms bond together. • ELECTRON PAIRS ARE LOCALIZED between the atoms they bond. • RESONANCE IS A REFINEMENT of the theory for more complex bonding situations. • VSEPR USES VALENCE BOND THEORY to predict molecular geometries
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Bonding Theories • Molecular Orbital Theory – There are orbitals in molecules that are equivalent to orbitals in atoms. • That is, a molecular orbital is not much different from an atomic orbital.
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C1403.2006.Week_Nine - The Nature of the Chemical Bond The...

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