Common
Chemical species
Substance composed of chemically identical molecular entities
Chemical species
A chemical species is a type of matter that displays a specific, uniquely identifying, set of properties. A systematic chemical name can be used to refer to a chemical species. In practice, chemists identify chemical species by differentiating between features of molecular structure that affect the interactions between molecules of a species and between molecules of different species. From strongest to weakest, these include type of bonding (ionic, covalent, metallic), isotopic composition, and, in ultra-cold environments, even the hyperfine structure of molecules.
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