Iodine is a chemical element with symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at a standard conditions that sublimes readily to form a violet gas. The elemental form was discovered by the French chemist Bernard Courtois in 1811.
Definition of CHOLLA. : any of numerous shrubby opuntias chiefly of the southwestern United States and Mexico that have needlelike spines partly enclosed in a papery sheath and cylindrical joints âcalled also cholla cactus.
The 995-megawatt Cholla Power Plant is located in northeastern Arizona near Holbrook. APS operates the plant and owns Units 1, 2 and 3, which are capable of producing 615 megawatts of electricity. PacifiCorp (PAC) owns the 380-megawatt Unit 4 - the largest unit at the plant.