A metal is generally considered to be a pure element which readily forms cations. Metals are characterised by their opacity and high thermal and electrical conductivities, the latter properties resulting from the delocalised and mobile nature of the electrons over the crystal structure.
A regular solid or hollow three-dimensional form in which every cross-section is a circle. Spheres are available with standard or precision tolerances, and can be supplied with different surface finishes depending on the material.
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