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 (15[1])point (-5[1])groups (15[1])model the symmetry of these materials, which subdivide seven “systems” devised by August Bravais (“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. These materials (10[1]-5[1])are modeled by a lattice of repeating (10[1])unit (10[1])cells. For 10 points, name these ordered solids exemplified by diamonds. ■END■ (10[3]0[4])

Back to tossups

Buzzes

Summary