Chemistry of finite bonded groups of atoms with molecular or metal-like skeletal bonding. Localized bond counts, skeletal-electron rules and delocalized shell models apply in different regimes.
An electronic model replacing discrete positive ionic cores by a smooth positive background. Approximately spherical clusters can be stabilized at closed angular-momentum shells.
A cluster whose nonhydrogen skeleton includes both carbon and aluminium. Exocyclic bonding must be distinguished from skeletal bonding when applying electron-counting rules.
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Cluster chemistry is a branch of chemistry that focuses on the study of clusters, which are small aggregates of atoms or molecules, typically ranging from a few to a few hundred atoms. These clusters can be composed of metal, non-metal, or semiconductor elements and can exhibit unique properties that differ significantly from those of individual atoms or bulk materials.