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[[Image:Empty-Lattice-Approximation-BCC-bands.svg|thumb|300px|Free electron bands in a BCC crystal structure]]
[[Image:Empty-Lattice-Approximation-HCP-bands.svg|thumb|500px|Free electron bands in a HCP crystal structure]]
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#
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Image:Cubic-body-centered.svg|Body-centered cubic (I)
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