Polonium tetraiodide
Polonium tetraiodide is a binary inorganic compound of polonium and iodine with the chemical formula . The compound forms volatile black crystals. Synthesis. 1. Action of iodine vapor on polonium metal: 2. Dissolution of polonium dioxide in hydroiodic acid: Properties. Physical properties. The compound forms black crystals that are insoluble in water. Chemical properties. The compound reacts with hydroiodic acid to form hexaiodopolonic acid: It can be reduced by hydrogen sulfide to yield polonium metal. It decomposes on heating.