oct 6 - Wed 6 Oct 10 Announcements Lecture 3 The localized...

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1 Wed, 6 Oct 10 • Announcements • Lecture 3 – The localized electron bonding model (13.9) – Lewis Structures (13.10) – Resonance (13.11) Lewis Dot Structures • Developed by G. N. Lewis to serve as a way to describe bonding in polyatomic systems. It’s a method of figuring out what molecules look like. Central idea : the most stable arrangement of electrons is one in which all atoms have a “noble” gas configuration. An atom typically forms as many bonds as it has “holes” in its valence shell.
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2 LDS Mechanics • Atoms are represented by atomic symbols surrounded by valence electrons. • Electron pairs between atoms indicate bond formation. • Bonding pairs are typically represented by a line: LDS Mechanics (cont.) • Three steps for “basic” Lewis structures: 1. Sum the valence electrons for all atoms to determine total number of electrons. 2. Use pairs of electrons to form a bond between each pair of atoms (bonding pairs).
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This note was uploaded on 10/26/2010 for the course CHEM 152 taught by Professor Chiu during the Fall '08 term at University of Washington.

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oct 6 - Wed 6 Oct 10 Announcements Lecture 3 The localized...

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