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Unformatted text preview: Chem 120A More QM in chemistry, time-independent Schrodinger equation 09/01/10 Fall 2010 Lecture 3 Other reasons for quantum mechanics in chemistry Quantum mechanics is needed to justify ad hoc explanations of behavior of molecules. Atoms: old quantum theory does not successfully describe the structure of non-hydrogenic atoms (multiple electrons in bound states) * For large atoms, the electron configuration doesnt depend on a single quantum number Old quantum theory only dealt with periodic motion, so what about other types of motion? Stability of chemical bonds ( i.e. formation of molecular orbitals) comes from exchange forces, which are described with quantum mechanics Figure 1: From www.chem.ucalgary.ca why is the picture of two balls in the bottom of the potential well wrong? Octet rule and VSEPR (successful rules for molecular bonding and structure) need physical explanation (QM provides this in the form of superposition of atomic orbitals) Some properties of atom/molecules (...
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- Fall '10