One of two foundational theories of quantum chemistry
"VBT" redirects here. For other uses, see VBT (disambiguation).
Electronic structure methods
Valence bond theory
Coulson–Fischer theory Generalized valence bond Modern valence bond theory
Molecular orbital theory
Hartree–Fock method Semi-empirical quantum chemistry methods Møller–Plesset perturbation theory Configuration interaction Coupled cluster Multi-configurational self-consistent field Quantum chemistry composite methods Quantum Monte Carlo
Density functional theory
Time-dependent density functional theory Thomas–Fermi model Orbital-free density functional theory Linearized augmented-plane-wave method Projector augmented wave method
Electronic band structure
Nearly free electron model Tight binding Muffin-tin approximation k·p perturbation theory Empty lattice approximation GW approximation Korringa–Kohn–Rostoker method
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In chemistry, valence bond (VB) theory is one of the two basic theories, along with molecular orbital (MO) theory, that were developed to use the methods of quantum mechanics to explain chemical bonding. It focuses on how the atomic orbitals of the dissociated atoms combine to give individual chemical bonds when a molecule is formed. In contrast, molecular orbital theory has orbitals that cover the whole molecule.[1]
^Murrell, J. N.; Kettle, S. F. A.; Tedder, J. M. (1985). The Chemical Bond (2nd ed.). John Wiley & Sons. ISBN 0-471-90759-6.
and 23 Related for: Valence bond theory information
In chemistry, valencebond (VB) theory is one of the two basic theories, along with molecular orbital (MO) theory, that were developed to use the methods...
theory (DFT) or Hartree–Fock (HF) models to the Schrödinger equation. Molecular orbital theory and valencebondtheory are the foundational theories of...
Modern valencebondtheory is the application of valencebondtheory (VBT) with computer programs that are competitive in accuracy and economy, with programs...
polarity of bonds. The octet rule and VSEPR theory are examples. More sophisticated theories are valencebondtheory, which includes orbital hybridization and...
share "valence", such as is discussed in valencebondtheory. In the molecule H 2, the hydrogen atoms share the two electrons via covalent bonding. Covalency...
bonds in valencebondtheory. For example, in a carbon atom which forms four single bonds, the valence-shell s orbital combines with three valence-shell...
In condensed matter physics, the resonating valencebondtheory (RVB) is a theoretical model that attempts to describe high-temperature superconductivity...
Valence shell electron pair repulsion (VSEPR) theory (/ˈvɛspər, vəˈsɛpər/ VESP-ər,: 410 və-SEP-ər) is a model used in chemistry to predict the geometry...
single covalent bond, a shared pair forms with both atoms in the bond each contributing one valence electron. The presence of valence electrons can determine...
unified bonding model. Instead, several traditional and advanced bonding models such as simple Lewis and VSEPR structure, valencebondtheory, molecular...
Chemistry, wherein he summarized this work (referred to widely now as valencebondtheory) and explained quantum mechanics in a way which could be followed...
generalized valencebond (GVB) is a method in valencebondtheory that uses flexible orbitals in the general way used by modern valencebondtheory. The method...
Valencebond (VB) computer programs for modern valencebond calculations:-[1] CRUNCH, by Gordon A. Gallup and his group. GAMESS (UK), includes calculation...
called the valence band. The name "valence band" was coined by analogy to chemistry, since in semiconductors (and insulators) the valence band is built...
the bonding of hypervalent species, the energetic contribution of an expanded octet structure is also not null. In this modern valencebondtheory study...
thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the...
a Coulomb attraction between them. For many-electron atoms, the valencebondtheory, laid down in 1927 by Walter Heitler and Fritz London, was a successful...
V is the number of valence electrons of the neutral atom in isolation (in its ground state); L is the number of non-bondingvalence electrons assigned...
stretched bonds. Bond order is also an index of bond strength and is also used extensively in valencebondtheory. bond order = number of bonding electrons -...
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