THE CONCEPT OF A CHEMICAL CLUSTER NUCLEUS

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The study explores the unique behavior of chemical clusters formed by main group and transition elements, revealing a phenomenon known as double capping. It introduces a parameter, K*, to categorize clusters based on their skeletal elements, which evolve through three distinct types: growing, mature, and capping series. Mature clusters correspond to the Closo series, while capping series indicate the formation of nuclei that consist of one or more skeletal elements. Notably, golden clusters typically center around one or two skeletal elements, while palladium carbonyl clusters involve two or more.