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==The crystal structures of metals==
<gallery>
Image:Cubic-body-centered.svg|Body-centered cubic (I)
Image:Cubic-face-centered.svg|Face-centered cubic (F)
Image:Hexagonal_lattice.svg|Hexagonal
</gallery>
[[Image:Empty-Lattice-Approximation-FCC-bands.svg|thumb|300px|Free electron bands in a FCC crystal structure]]
[[Image:Empty-Lattice-Approximation-BCC-bands.svg|thumb|300px|Free electron bands in a BCC crystal structure]]
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