Answer: Iodine
Notes: Lustrous means shiny or gleaming. Most nonmetals do not have a shiny appearance. However, iodine is an exception. Iodine is a nonmetal that appears lustrous or metallic. It has a shiny, metallic luster in its solid state due to its large number of delocalized electrons. This is a rare characteristic for nonmetals and iodine and carbon are examples of very few exceptions.
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