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 the right is displayed the color kobi. The color name "kobi" for this light tone of red-violet has been in use since 2001, when it was promulgated as one of the colors on the Xona.com Color List. The color pink lavender is displayed at the right. The source of this color is the "Pantone Textile Paper eXtended (TPX)" color list, color #14-3207 TPX—Pink Lavender. Puce is a medium grayish red-violet color. The color pale red-violet (identical to the web color "pale violet red") is displayed at the right. This color is a pale tone of red-violet. The color violet-red is