0ct 11 - Mon, 11 Oct 10 Announcements Lecture 5 Molecular...

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1 Mon, 11 Oct 10 • Announcements • Lecture 5 – Molecular structure: the VSEPR model (13.13, through pg. 640 only ) What Molecules Look Like Recall that we have two types of electron pairs: bonding and lone. The Lewis Dot Structure approach provided some insight into molecular structure in terms of bonding, but what about 3D geometry? Valence-Shell Electron-Pair Repulsion (VSEPR) . A model of molecular geometry in which the 3D structure is determined by minimizing repulsion of electron pairs/groups.
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2 2 electron pairs 3 electron pairs 4 electron pairs In VSEPR, bonding and lone pairs of electrons are distributed around a central atom such that electron-electron repulsions are minimized. Arranging Electron Pairs • Example: CH 4 (bonding pairs only) • Must consider both bonding and lone pairs in minimizing repulsion.
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Arranging Electron Pairs (cont.) • Example: NH 3 (both bonding and lone pairs).
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0ct 11 - Mon, 11 Oct 10 Announcements Lecture 5 Molecular...

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