CHEM 112 Lecture Notes - Lecture 19: Valence Bond Theory, Molecular Orbital Theory, Orbital Hybridisation
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14 Nov 2018
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Bond length: the distance between the centers of two atoms joined by a covalent bond. Lewis theory is useful for many purposes to explain chemical bonding. However, it doesn"t offer explanation for even very simple molecular properties such as molecular geometry. We will introduce two new approaches: valence bond theory (vb, molecular orbital theory. Bond formation between two hydrogen atoms: when they are far apart the potential energy is 0. As they approach each other each electron is attracted to the nucleus of the other atom while repulsions also occur between electrons and between nuclei. For each h atom, one electron is in its 1s ao. So formation of a covalent bond between two h atoms is due to the overlap between their 1s aos, each being half filled. Hybridization of atomic orbitals: hybridization orbitals are blended atomic orbitals obtained when two or more nonequivalent orbitals of the same atom combine in prepareation for covalent bond formation.
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