| 词汇 | valence-bond-theory |
| 释义 | BETA valence bond theorycollocation in Englishmeanings of bondand theoryThese words are often used together. Click on the links below to explore the meanings. bond noun uk /bɒnd/ us /bɑːnd/ a close connection joining two or ... See more at bond theory noun[ C or U ] uk /ˈθɪə.ri/ us /ˈθɪr.i/ a formal statement of the rules on which a subject of study is based or of ideas that are suggested to explain a fact or event or, more generally, an opinion ... See more at theory Examples of valence bond theoryvalence bond theory In valencebondtheory, covalent bonds are assumed to consist of two electrons lying in overlapping, usually hybridised, atomic orbitals from bonding atoms. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In valencebondtheory, it is described as a resonance hybrid with equal contributions from two canonical forms that are mirror images of each other. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is conventional in organic chemistry to write isocyanates with two double bonds, which accords with a simplistic valencebondtheory of the bonding. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In valencebondtheory, delocalization in benzene is represented by resonance structures. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A valencebondtheory approach which just considered s and p orbitals would describe the bonding in terms of resonance between two resonance structures. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is similar to other modern valencebondtheory methods. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In valencebondtheory, the two electrons on the two atoms are coupled together with the bond strength depending on the overlap between them. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Simple valencebondtheory would predict a quadruple bond as the only way to satisfy the octet rule for carbon in dicarbon. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Covalent bonds are better understood by valencebondtheory or molecular orbital theory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. If a single set of these orbitals is combined with all linear independent combinations of the spin functions, we have spin-coupled valencebondtheory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Orbital hybridisation allowed valencebondtheory to successfully explain the geometry and properties of a vast number of molecules. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Formal charges are used in valencebondtheory for some canonical forms used to construct a resonance hybrid. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Valencebondtheory concerns itself with the formation of sigma and pi bonds. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. With more complicated compounds, such as metal complexes, valencebondtheory is less applicable and alternative approaches, such as the molecular orbital theory, are generally used. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Valencebondtheory proposes that covalent bonds consist of two electrons lying in overlapping, usually hybridised, atomic orbitals from two bonding atoms. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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