2019 U.S. National Chemistry Olympiad Local Section Exam Question 16

A two-dimensional slice through the lattice of a crystalline solid containing two different elements X and Y is shown schematically and to scale below. What type of solid is it?

(A) A metallic alloy such as FeCr
(B) A molecular solid such as IBr
(C) An ionic compound such as LiCl
(D) A network covalent solid such as SiC

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Test ID: 1894