9-6 VSEPR (Sections 12.8, 12.9, 12.10) And you.

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Presentation transcript:

9-6 VSEPR (Sections 12.8, 12.9, 12.10) And you

The VSEPR (Valence Shell Electron Pair Repulsion) Model is useful in predicting the 3D shapes of molecules. The main idea of the model is that electron pairs on the central atom, either bonding or nonbonding, will repel each other to maximize the distance between them. In other words, the electron regions (bonding or nonbonding) on the central atom move as far apart as possible. Use your “shape sheet” (p3) for the table

The convention to show 3D bonds In plane of paper = line Out of plane (toward you) = Wedge (dark triangle) Behind the plane (into the paper) = dashes

BeI2 Bonding e- pairs (on central atom): Non-bonding e- pairs: Geometry of central atom: 3D shape: Bond angles: 2 Linear 180o

BCl3 Bonding e- pairs (on central atom): Non-bonding e- pairs: Geometry of central atom: 3D shape: Bond angles: 3 Triangular (trigonal) plane 120o

CH4 Bonding e- pairs (on central atom): Non-bonding e- pairs: Geometry of central atom: 3D shape: Bond angles: 4 Tetrahedron 109.5o

PBr5 Bonding e- pairs (on central atom): 5 Non-bonding e- pairs: Geometry of central atom: 3D shape: Bond angles: 5 Trigonal bipyramidal 90o and 120o

SCl6 Bonding e- pairs (on central atom): Non-bonding e- pairs: Geometry of central atom: 3D shape: Bond angles: 6 Octahedron 90o

PH3 Bonding e- pairs (on central atom): Non-bonding e- pairs: Geometry of central atom: 3D shape: Bond angles: *note 107<109.5 because unbound e-s take up more space than bound e-s 3 (4 regions) 1 Trigonal pyramidal (triangular pyramid) ~107o

H2S Bonding e- pairs (on central atom): Non-bonding e- pairs: Geometry of central atom: 3D shape: Bond angles: *note 104.5<120 as unbound e-s take up more space than bound e-s 2 (4 regions) 2 Bent (angular) ~104.5o