Cluster - Structure, Properties, Types | Britannica
https://www.britannica.com/science/cluster/Structure-and-properties
WEBCluster - Structure, Properties, Types: The abundance distributions for several kinds of clusters show that there are certain sizes of clusters with exceptional stability, analogous to the exceptional stability of the atoms of the inert gases helium, neon, argon, krypton, and xenon and of the so-called magic number nuclei—i.e., the sequence ...
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