Chapter_7 Oct_05 Lecture_20.pptx

# Molecular geometry valence shell electron pair

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How to predict geometry for a given molecule? Molecular Geometry Valence-Shell Electron-Pair Repulsion Theory = VSEPR theory/model The basis of the VSEPR model is that electrons repel each other . Electrons arrange to minimize repulsive interactions— trying to stay as far apart as possible

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Electron Domains 6 Electrons are found in various domains. electron domains = lone pairs or bonds on the central atom lone pair = single bond = double bond = triple bond = 1 electron domain
Common Structures AB x A is the central atom surrounded by x B atoms. x can have integer values of 1 to 6.

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Electron-Domain Geometry The electron domain geometry is the arrangement of electron domains around the central atom (5 basic geometries) In an AB x molecule, a bond angle is the angle between two adjacent A-B bonds (A is the central atom) 1. Linear : atoms lie in a straight line -All diatomic molecules: (A 2 or AB) -AB 2 or ABC -bond angle = 180° 2 electron domains Linear
Electron-Domain Geometry 2 electron domains Linear H H O = O C O H Br CO 2 Cl Be Cl BeCl 2

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Electron-Domain Geometry 2. Trigonal Planar (planar triangular): all atoms in a plane -Bond angles = 120° 3 electron domains Trigonal planar
Electron-Domain Geometry 3 electron domains Trigonal planar BCl 3 SO 2 O 3 O O O = S O O = =
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• Fall '16
• hawk
• Atom, Molecule, Chemical bond, electron-domain geometry

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