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==The crystal structures of metals==
Apart from a few exotic exceptions, [[metal]]s crystallize in three kinds of crystal structures: the BCC and FCC [[cubic crystal system|cubic crystal structures]] and the [[hexagonal crystal system|hexagonal]] close-packed [[close-packing of spheres#fcc_and_hcp_lattices|HCP]] crystal structure.
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{{multiple image
|align = left
|image1 = Empty-Lattice-Approximation-BCC-bands.svg
|caption1 = Free electron bands in a BCC crystal structure
|width1 = 180
|image2 = Empty-Lattice-Approximation-FCC-bands.svg
|caption2 = Free electron bands in a FCC crystal structure
|width2 = 180
|image3 = Empty-Lattice-Approximation-HCP-bands.svg
|caption3 = Free electron bands in a HCP crystal structure
|width3 = 300
}}
{{clear}}
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