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.
A Scientific Look At Cactus: Prickly pear, also known as Opuntia ficus-indica, is a cactus plant growing in the arid regions of Mexico, Southern California and Arizona. Nopal is a thin, flat and oval stems of the cactus plant, consumed as a vegetable. Prickly pear cactus juice has been used for centuries in Latin and North American cultures.