valence bond theory

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• Valence bond theory — In chemistry, valence bond theory explains the nature of a chemical bond in a molecule in terms of atomic valencies. [Murrel, JN, Kettle, SF Tedder, JM The Chemical Bond , John Wiley Sons (1985) ISBN 0 471 90759 6] Valence bond theory summarizes… …   Wikipedia

• Modern valence bond theory — is the term used to describe applications of valence bond theory with computer programs that are competitive in accuracy and economy with programs for the Hartree Fock method and other molecular orbital based methods. The latter methods dominated …   Wikipedia

• Valence bond codes — VB computer programs for modern valence bond calculations: * CRUNCH is by Gordon A. Gallup and his group. [ [http://phy ggallup.unl.edu/crunch CRUNCH] ] * GAMESS (UK) includes calculation of VB wave functions by the TURTLE code, due to J.H. van… …   Wikipedia

• Generalized valence bond — The generalized valence bond (GVB) method is one of the simplest and oldest valence bond method that uses flexible orbitals in the general way used by modern valence bond theory. The method was developed by the group of William A. Goddard, III… …   Wikipedia

• Valence — may refer to:In molecules, atoms, or subatomic particles* Valence (chemistry) * Valence bond theory in chemistry * Valence shell in chemistry * Valence band in physics * Valence quarks (see quark model) in particle physics In other sciences*… …   Wikipedia

• Bond order — is the number of bonds between a pair of atoms. For example in nitrogen N≡N the bond order is 3, in acetylene H−C≡C−H the bond order between the two carbon atoms is 3 and the C−H bond order is 1. Bond order gives an indication to the stability of …   Wikipedia

• Valence (chemistry) — For other uses, see Valence (disambiguation). In chemistry, valence, also known as valency or valence number, is a measure of the number of bonds formed by an atom of a given element. Valence can be defined as the number of valence bonds[1] a… …   Wikipedia

• Bond valence method — The bond valence method (or bond valence sum) (not to be mistaken for the valence bond theory in quantum chemistry) is a popular method in coordination chemistry to estimate the oxidation states of atoms.The basic idea is that the valence V of an …   Wikipedia

• VSEPR theory — Valence shell electron pair repulsion (VSEPR) theory is a model in chemistry used to predict the shape of individual molecules based upon the extent of electron pair electrostatic repulsion.[1] It is also named Gillespie–Nyholm theory after its… …   Wikipedia

• Chemical bond — A chemical bond is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electromagnetic force attraction between opposite charges, either between electrons and… …   Wikipedia

• Molecular orbital theory — In chemistry, molecular orbital (MO) theory is a method for determining molecular structure in which electrons are not assigned to individual bonds between atoms, but are treated as moving under the influence of the nuclei in the whole… …   Wikipedia