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Subject - General Chemistry

In a closest-packed structure, spheres are arranged in a pattern that allows for the densest packing of spheres of equal size. A closest-packed arrangement results from the stacking of hexagonal layers of spheres. In a hexagonal layer every sphere is surrounded by six spheres in the same layer. These layers are stacked so that the spheres of one layer lie in the holes of the layer below. The packing efficiency of a closest-packed structure is 74%.

See also: hexagonal closest-packed structure , cubic closest-packed structure , packing efficiency