The inadequacy of the simple Lewis structure view of molecules led to the development of the more generally applicable and accurate valence bond theory of Hund.
32.
In the language of valence bond theory, these molecules can be described as adopting sp orbital hybridisation, featuring two sigma and two pi bonds.
33.
Note that several other programs, as well as some of those above, can do Goddard's Generalized Valence Bond ( GVB ) methods.
34.
Modern valence bond theory replaces the simple linear combination of the two atomic orbitals with a linear combination of all orbitals in a larger Coulson Fischer method.
35.
For example, in perchlorates, chlorine has seven valence bonds and ruthenium, in the + 8 oxidation state in ruthenium tetroxide, has eight valence bonds.
36.
For example, in perchlorates, chlorine has seven valence bonds and ruthenium, in the + 8 oxidation state in ruthenium tetroxide, has eight valence bonds.
37.
After the development in 1928 of the valence bond theory, the three possible Dewar structures were considered as minor resonance contributors in the overall description of benzene.
38.
It can then be seen that the simple molecular orbital approach gives too much weight to the ionic structures while the simple valence bond approach gives too little.
39.
With more complicated compounds, such as metal complexes, valence bond theory is less applicable and alternative approaches, such as the molecular orbital theory, are generally used.
40.
Their work was based on the valence bond model, which assumes that a chemical bond is formed when there is good overlap between the atomic orbitals of participating atoms.
