An elementA substance containing only one kind of atom and that therefore cannot be broken down into component substances by chemical means. having properties intermediateIn chemical kinetics, a species that is formed in an early step in a reaction mechanism and then consumed in a later step; evidence of existence of an intermediate may be important for the interpretation of a rate law. between a metalAn element characterized by a glossy surface, high thermal and electrical conductivity, malleability, and ductility. and a non-metal.
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