Abstract
In the class of homeotypes of Si the model of electron pair bonds explains some phenomena such as the stability of Grimm-Sommerfeld phases. Similar explanations follow also from the model of electron spatial correlations. However, there are various phenomena, not explained so far by the pair model, but well interpreted by the correlations model, for instance stacking homeotypes of ZnS.r such as AlN. The correlations model has a more extended range because it considers more parameters than the pair model. A bonding type of the correlations model does not only classify the valence electron state but also properties of the core electron states. The bonding types based on the correlations model frequently lead to interesting experimental questions.
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