What substance, under normal conditions, is a dark gray solid with a violet metallic luster, easily sublimes

What substance, under normal conditions, is a dark gray solid with a violet metallic luster, easily sublimes and in the gaseous state has a violet color? In the answer, indicate the name of this substance in the nominative case, singular

Iodine is a solid substance. dark gray with a purple metallic sheen. Iodine molecules are formed by two atoms that are connected by a covalent non-polar bond. When heated, iodine turns into violet vapors, which, when cooled, turn back into crystals. This process is called sublimation (the transition of a substance from a solid to a gaseous state, bypassing the liquid). Iodine is poorly soluble in water, but well soluble in organic solvents: alcohol, gasoline, chloroform, benzene. It is used in large quantities for the preparation of medicines.