SOLVED:Close packing of spheres in two dimensions can be achieved by arranging them in sheets as shown by the spheres labeled A in the first diagram shown. Close packing in three dimensions can be achieved by stacking these sheets so that each atom "rests" in the "hollows" formed by three atoms in the sheet below. Frequently encountered close packed arrangements are hexagonal close packed (ABAB sequence) and cubic close packed (ABCABC sequence), where A, B, and C indicate the different registrie

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