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.
Advice For Christmas Cactus Care. While the Christmas cactus may be known under various names (like Thanksgiving cactus or Easter cactus), the scientific name for Christmas cactus, Schlumbergera bridgessii, remains the same â while other plants may differ. This popular, winter-flowering houseplant makes a great addition to nearly any indoor setting.