The principle underlying the convergence theory of chemical clusters is based on the noble gas configurations which we know are very stable. The skeletal number (k) is associated with groups of chemical elements and specifically the valence electrons of the groups of the periodic table of chemical elements. Following the discovery of the skeletal number (k), it became imperative to attach a chemical meaning to it. The skeletal number (k) simply represents the NUMBER OF ELECTRON PAIRS needed for the respective element to attain a noble gas configuration. This means that if we add a set of electron pairs equivalent to (k), the resultant mono-skeletal cluster will attain a noble gas configuration with a k-value of zero(K=0). Thus, the convergence theory for the skeletal elements can be represented by a simple equationE(k) + k[2H] E(H)2k[K=0]; the (k) symbol is assigned to a naked skeletal element, while the (K) symbol is reserved for a mono-skeletal element with ligands or multi-skeletal element cluster with or without ligands.
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