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Auteur : David Cooper
Catégorie : Livres anglais et étrangers,Science,Chemistry
Broché : * pages
Éditeur : *
Langue : Français, Anglais

Valence bond (VB) theory, which builds the descriptions of molecules from those of its constituent parts, provided the first successful quantum mechanical treatments of chemical bonding. Its language and concepts permeate much of chemistry, at all levels. Various modern formulations of VB theory represent serious tools for quantum chemical studies of molecular electronic structure and reactivity. In physics, there is much VB-based work (particularly in semi-empirical form) on larger systems. Importance of TopicThe last decade has seen significant advances in methodology and a vast increase in the range of applications, with many new researchers entering the field.Why This TitleValence Bond Theory succeeds in presenting a comprehensive selection of contributions from leading valence bond (VB) theory researchers throughout the world. It focuses on the vast increase in the range of applications of methodology based on VB theory during the last decade and especially emphasizes recent advances.

Télécharger Valence Bond Theory de David Cooper livre En ligne

1.7: Valence Bond Theory - Chemistry LibreTexts ~ The valence bond theory, along with the hybrid orbital concept, does a very good job of describing double-bonded compounds such as ethene. Three experimentally observable characteristics of the ethene molecule need to be accounted for by a bonding model: Ethene is a planar (flat) molecule. Bond angles in ethene are approximately 120 o, and the carbon-carbon bond length is 134 pm, significantly .

Valence Bond Theory, its History, Fundamentals, and ~ Valence bond theory in Pauling’s view is a quantum chemical version of Lewis’s theory of valence. In Pauling’s work, the long sought for Allgemeine Chemie of Ostwald was finally founded.2 Origins of MO Theory and the Roots of VB-MO Rivalry At the same time that Slater and Pauling were developing their VB theory,17 Mulliken21-24 and Hund25,26 were developing an alternative approach called .

8.1: Valence Bond Theory - Chemistry LibreTexts ~ Valence bond theory describes bonding as a consequence of the overlap of two separate atomic orbitals on different atoms that creates a region with one pair of electrons shared between the two atoms. When the orbitals overlap along an axis containing the nuclei, they form a σ bond. When they overlap in a fashion that creates a node along this axis, they form a π bond. Glossary overlap .

9.2: Valence Bond Theory - Chemistry LibreTexts ~ Valence bond theory is an approach to bonding where molecular orbitals (wave functions) are considered to be the result of the mixing of pure atomic orbitals. For example, in the second period there are 4 orbitals, one 2s and three 2p, and for the hydrogen atom, the s orbital is lower in energy. When a second period atom forms two bonds, as in BeH 2, the beryllium has two bonding orbitals and .

10.2: Introduction to Valence Bond Theory - Chemistry ~ Since Valence Bond theory begins with the basis that atomic orbitals overlap to create bonds and through that reasoning, one can see that electrons are spin paired when bonds overlap, dioxygen is indeed predicted to be diamagnetic if Valence Bond Theory is used. In reality, that is not the case. Also, sp 2 d and sp 3 both have a coordinate number of four. Thus, Valence Bond Theory cannot .

12.2: Valence Bond Theory - Chemistry LibreTexts ~ Overlap. Valence bond theory describes a covalent bond as the overlap of half-filled atomic orbitals (each containing a single electron) that yield a pair of electrons shared between the two bonded atoms. We say that orbitals on two different atoms overlap when a portion of one orbital and a portion of a second orbital occupy the same region of space. . According to valence bond theory, a .

8.1 Valence Bond Theory / Chemistry - Lumen Learning ~ Valence bond theory describes bonding as a consequence of the overlap of two separate atomic orbitals on different atoms that creates a region with one pair of electrons shared between the two atoms. When the orbitals overlap along an axis containing the nuclei, they form a σ bond. When they overlap in a fashion that creates a node along this axis, they form a π bond. Exercises. Explain how .

Valence Bond Theory / Boundless Chemistry ~ valence bond theory: a covalent bond forms between the two atoms by the overlap of half-filled valence atomic orbitals from each atom. In chemistry, valence bond (VB) theory is one of two basic theories—along with molecular orbital (MO) theory—that use quantum mechanics to explain chemical bonding. According to VB theory, a covalent bond forms from the physical overlap of half-filled .

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Valence Bond Theory - Postulates and Applications of ~ Valence bond theory explains a covalent bond as the intersection of half-filled atomic orbitals that produce a pair of electrons pooled between the two bonded atoms or molecules. We say that orbitals on two different molecules intersect when a quota of one orbital and a quota of a second orbital occupy the same area of space. According to valence bond theory (VBT), covalent bond effects when .

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Orbitales moléculaires - BnF ~ Valence (chimie théorique) . Discovering chemistry with natural bond orbitals (2012) Orbitals in chemistry (2009) . Molecular orbital calculations using chemical graph theory (1993) Orbital symmetry and reaction mechanism (1992) .

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Valence_bond_theory - chemeurope ~ Valence bond theory views aromatic properties of molecules as due to resonance between Kekule, Dewar and possibly ionic structures, while molecular orbital theory views it as delocalisation of the π-electrons. The underlying mathematics are also more complicated limiting VB treatment to relatively small molecules. On the other hand, VB theory provides a much more accurate picture of the .

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Valence Bond (VB) Theory Definition - ThoughtCo ~ Valence bond theory was developed to describe resonance and orbital hybridization. In 1931, Pauling published a paper on valence bond theory entitled, "On the Nature of the Chemical Bond." The first computer programs used to describe chemical bonding used molecular orbital theory, but since the 1980s, principles of valence bond theory have become programmable. Today, the modern versions of .

Valence Bond Theory (VBT) Vs. Molecular Orbital Theory ~ Valence bond theory is a molecular theory that is used to define the chemical bonding of atoms in a molecule. Valence bond theory is based on localized bond approach, in which it assumes that the electrons in a molecule occupy atomic orbitals for the individual atoms. As a chemical bonding theory, it explains the bonding between two atoms is caused by the overlap of half-filled atomic orbitals .

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