Chapter 10-11 - Chemical Bonding II Molecular Geometry and...

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Chemical Bonding II: Molecular Geometry and Hybridization of Atomic Orbitals Chapter 10
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Valence shell electron pair repulsion (VSEPR) model: Predict the geometry of the molecule from the electrostatic repulsions between the electron (bonding and nonbonding) pairs. AB 2 2 0 Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry linear linear B B
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Cl Cl Be 2 atoms bonded to central atom 0 lone pairs on central atom
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Other examples of AB 2 electron-group geometries: CO 2 (carbon dioxide, O=C=O) CS 2 (carbon disulfide, S=C=S) OCS (carbonyl sulfide, O=C=S) SCN (thiocyanate ion)
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AB 2 2 0 linear linear Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry VSEPR AB 3 3 0 trigonal planar trigonal planar
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Other examples of AB 3 electron-group geometries: CH 2 O (formaldehyde) COCl 2 NO 3 (resonance)
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AB 2 2 0 linear linear Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry VSEPR AB 3 3 0 trigonal planar trigonal planar AB 4 4 0 tetrahedral tetrahedral
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Other examples of AB 4 electron-group geometries: CCl 4 CHCl 3 CCl 2 F 2 SiF 4 SO 4 2– (resonance) PO 4 3- (resonance)
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AB 2 2 0 linear linear Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry VSEPR AB 3 3 0 trigonal planar trigonal planar AB 4 4 0 tetrahedral tetrahedral AB 5 5 0 trigonal bipyramidal trigonal bipyramidal
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Other examples of AB 5 electron-group geometries: AsF 5 SbF 5
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AB 2 2 0 linear linear Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry VSEPR AB 3 3 0 trigonal planar trigonal planar AB 4 4 0 tetrahedral tetrahedral AB 5 5 0 trigonal bipyramidal trigonal bipyramidal AB 6 6 0 octahedral octahedral
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Other examples of AB 6 electron-group geometries: SeCl 6 IOF 5 IO 2 F 4
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Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry VSEPR AB 3 3 0 trigonal planar trigonal planar AB 2 E 2 1 trigonal planar bent
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Examples of AB 2 E electron-group geometries: SnCl 2 SO 2 (resonance) NO 2 (resonance)
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Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry VSEPR AB 3 E 3 1 AB 4 4 0 tetrahedral tetrahedral tetrahedral trigonal pyramidal
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