Electron Domain Geometries We will consider electron domain geometries for two three four five and six electron domain atoms Number of electron domains Electron domain geometry Ideal angles 2 Linear 180E 3 Trigonal planar 120E 4 Tetrahedral 109 5E Trigonal bipyramidal 180E 120E 90E Octahedral 180E 90E 5 6 Molecular Geometries Within each electron domain geometry there will be two or more molecular geometries depending on the number of bonding and nonbonbing domains The linear electron domain system Total electron domains Bonding domains Nonbonding domains Molecular geometry 1 1 1 linear 2 2 0 linear X 1 2 X 1 Trigonal planar electron domain system Total electron domains Bonding domains Nonbonding domains Molecular geometry 3 1 2 linear 2 1 bent 120E 3 0 trigonal planar 1 1 3 1 2 2 Tetrahedral electron domain system Total electron domains Bonding domains Nonbonding domains Molecular geometry 4 1 3 linear 2 2 bent 109E 3 1 trigonal pyramidal 4 0 tetrahedral 1 1 1 1 2 3 2 3 4 2 Trigonal bipyramidal electron domain system Total electron domains 1 Bonding domains Nonbonding domains Molecular geometry 2 3 linear 3 2 t shaped 4 1 seesaw 5 0 trigonal bipyramid 1 1 1 3 3 3 5 4 4 2 2 2 2 Octahedral electron domain systems Total electron domains Bonding domains Nonbonding domains Molecular geometry 6 2 4 linear 3 3 t shaped 4 2 square planar 5 1 square pyramid 6 0 octahedral 1 1 3 2 5 3 2 3 2 1 4 1 4 2 5 3 2 1 4 6
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