Round 5: Tossup 17

Dan Shechtman won the 2011 Nobel Prize in Chemistry for discovering the “quasi-” type of these materials, which can be modeled by Penrose tilings. Frank Wilczek proposed a “time” analogue of these materials in which particles display repetitive motion. 32 point groups model the symmetry of these materials, which subdivide seven “systems” devised by August Bravais (15[1])(“bruh-VAY”) such as (*) triclinic and orthorhombic. The most space efficient types of these materials are either hexagonal close-packed or face-centered cubic. (10[1])These (-5[1])materials are modeled by a lattice of repeating unit cells. (10[1])For 10 points, name these ordered solids exemplified by diamonds. ■END■ (10[1]0[2])

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