Presentation12_061020

Presentation12_061020 - Chem 6A Presentation #12 Overview...

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Chem 6A Presentation #12 2006-10-20 1 Overview Chapter 2: Chemical Bonds Resonance Formal charge Exceptions to the octet rule Radicals Expanded valence shells
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2 Resonance What happens if more than one correct Lewis structure can be drawn for a molecule? These Lewis structures may be considered resonance structures or resonance forms . The true bonding in the molecule is often best described as a blend of these forms: a resonance hybrid . Classic example: ozone O 3
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3 Resonance Formal charge : The charge an atom in a molecule would have if all the bonding electrons were equally shared by bonded atoms. Formal charge of atom = (valence e ) – (lone pair e ) – (shared e ) The formal charges on the atoms must add up to the overall electric charge of the species (0 for molecules, ionic charge for polyatomic ions).
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4 Resonance The most important resonance structures are the ones that help best to describe the actual electron distribution of the molecule. Important resonance structures for a molecule often:
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Presentation12_061020 - Chem 6A Presentation #12 Overview...

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