Cluster

 

In chemistry, a cluster is an ensemble of bound atoms intermediate in size between a molecule and a bulk solid. Clusters exist of diverse stoichiometries and nuclearities. For example, carbon and boron atoms form fullerene and borane clusters, respectively. Transition metals and main group elements form especially robust clusters.

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An aggregation of atoms, typically metal atoms of the same kind. Their physical properties (e.g. Electrical, optical) can strongly differ from that of the bulk structure due to quantum effects.

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A cluster, in the "nano" sense, is an aggregation of atoms or molecules.

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1. A group of the same or similar elements gathered or occurring closely together; a bunch: "She held out her hand, a small tight cluster of fingers" Anne Tyler.

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