Chemical element named mendelevium in honor of D.I. Mendeleev, the first to arrange the elements in a periodic manner. Most recently, the synthesis of element 118 (since named oganesson) was reported in October 2006, and the synthesis of element 117 (tennessine) was reported in April 2010. Ten materials familiar to various prehistoric cultures are now known to be chemical elements: Carbon, copper, gold, iron, lead, mercury, silver, sulfur, tin, and zinc. Three additional materials now accepted as elements, arsenic, antimony, and bismuth, were recognized as distinct substances prior to 1500 AD. Phosphorus, cobalt, and platinum were isolated before 1750. Most of the
Red-violet color is displayed at right and is identical to the web color medium violet red. By the 1970s, because of the advent of psychedelic art, artists became used to brighter pigments, and pigments called "purple" or "bright purple" that are the pigment equivalent of electric purple became available in artists pigments and colored pencils. Reproducing electric purple in pigment requires adding some white pigment and a small amount of blue pigment to red-violet pigment. Even then, the reproduction will not be exact because it is impossible for pigment colors to be so bright as colors displayed on a computer. At