Packet 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 (15[1])proposed (15[1])a “time” analogue of these (15[1])materials in which particles display repetitive motion. 32 (15[1])point (-5[1])groups (15[1])model the symmetry of these materials, (15[1])which subdivide seven “systems” devised by August Bravais (15[1])(“bruh-VAY”) such as (*) triclinic and orthorhombic. (10[1])The most space efficient types of these materials (10[1])are either hexagonal close-packed (10[1])or face-centered cubic. (10[2])These (-5[1])materials (10[1]-5[1])are modeled by a lattice of repeating (10[1])unit (10[1])cells. (10[1])For 10 points, name these ordered solids exemplified by diamonds. ■END■ (10[4]0[6])

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