L19 - Paul Adrien Maurice Dirac(19021984 The underlying...

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    The  underlying   physical   laws  necessary for the mathematical theory of a large part of  physics and the  whole   of   chemistry  are thus  completely   known , and the difficulty is only  that the exact application of these laws leads to equations much too complicated to be  soluble. It therefore becomes desirable that approximate practical methods of applying  quantum mechanics should be developed, which can lead to an explanation of the main  features of complex atomic systems without too much computation.  Proceedings of the Royal Society of London. Series A, Containing Papers of a  Mathematical and Physical Character, Vol. 123, No. 792 (Apr. 6, 1929) Paul Adrien Maurice Dirac (1902-1984) BTW: computational chemists are still developing these ``approximate practical methods’’;  Kohn and Pople received Nobel Prize in Chemistry in 1998 for two such methods.
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    The Central Themes of VB Theory A covalent bond forms when the orbitals of two atoms overlap and the  overlap region, which is between the nuclei, is occupied by a pair of  electrons. A molecule is viewed as a collection of atoms connected by covalent bonds. Bonds are described in terms of orbitals associated with  individual nuclei (localized on individual nuclei). The Central Themes of MO Theory A molecule is viewed as a collection of nuclei surrounded by delocalized  molecular orbitals  (orbitals that extend over the entire molecule).
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