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Unformatted text preview: Chemistry 3820 Lecture Notes Dr.R.T.Boer Page 15 2.2 VSEPR theory Just as Lewis structures give us a fast road to mapping the electrons of molecules, the Valence Shell Electron Pair Repulsion theory gives us a quick approach to determining molecular structure for many common main-group compounds. It is not much use for transition metal complexes, except those of the metals in their highest possible oxidation states. This concept, which is especially due to Prof. Ronald Gillespie of McMaster University (along with Prof. Nyholm of the U.K.), considers the electron pairs in molecules to be bound regions of negative charge, which naturally repel each other. The basic arrangements which minimize electron pair repulsions are: # of pairs basic shape hybridization of the central atom 2 linear sp 3 trigonal planar sp 2 4 tetrahedral sp 3 5 trigonal bipyramidal dsp 3 6 octahedral d 2 sp 3 But since the central atom may have lone pairs, which do not contribute to the description of the shape of the molecule, there are...
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