Molecular structures to remember CO2 N3- , BCl2 BF3 SO3, CO32- SO2 2 Electron domains à Electron Domain Geometry = Linear 2 bonded & 0 Lone Pairs Molecular Geometry= Linear Bond angles 180° Sp Hydridisation 3 Electron domains à Electron Domain Geometry = Planar Triangular 3 bonded & 0 Lone Pairs Molecular Geometry= Planar Triangular Bond angles 120° Sp2 Hydridisation 3 Electron domains à Electron Domain Geometry = Planar Triangular 3 bonded & 1 Lone Pair Molecular Geometry= V-Shaped Bond angles 117° Sp2 Hydridisation CH4 4 Electron domains à Electron Domain Geometry = Tetrahedral 4 bonded & 0 Lone Pairs Molecular Geometry= Tetrahedral Bond angles 109.5° Sp3 Hydridisation PF3 NH3 H2O SCl2, CH2 PF5 PCl5 SF4 4 Electron domains à Electron Domain Geometry = Tetrahedral 4 bonded & 1 Lone Pair Molecular Geometry= Pyramidal Bond angles 107° Sp3 Hydridisation 4 Electron domains à Electron Domain Geometry = Tetrahedral 4 bonded & 2 Lone Pairs Molecular Geometry= V-shaped/Bent Bond angles 105° Sp3 Hydridisation 5 electron domainsà Electron domain geometry = triangular bipyramidal 5 bonded pairs (No L.P.) à Molecular geometry = triangular bipyramidal Bond angles 90° & 120° 5 electron domainsà Electron domain geometry = triangular bipyramidal 4 bonded pairs & 1 Lone Pair à Molecular geometry = see-saw (unsymmetrical tetrahedron) Bond angles 90° & 117° ClF3 BrF3 I3 XeF2 SF6 XeF2 BrF5 IF5 5 electron domainsà Electron domain geometry = triangular bipyramidal 3 bonded pairs & 2 Lone Pairs à Molecular geometry = T-shaped Bond angles 90° & 180° 5 electron domainsà Electron domain geometry = triangular bipyramidal 2 bonded pairs & 3 Lone Pairs à Molecular geometry = Linear Bond angles 180° 6 electron domainsà Electron domain geometry = Octahedral 6 bonded pairs & 0 Lone Pairs à Molecular geometry = Octahedral Bond angles 90° 6 electron domainsà Electron domain geometry = Octahedral 5 bonded pairs & 1 Lone Pair à Molecular geometry = Square Pyramidal Bond angles 90° XeF4 IF4- 6 electron domainsà Electron domain geometry = Octahedral 4 bonded pairs & 1 Lone Pair à Molecular geometry = Square Planar Bond angles 90° & 180°