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
Violet cuckoo Violet cuckoo The violet cuckoo ("Chrysococcyx xanthorhynchus") is a species of cuckoo in the family Cuculidae. The males have glossy violet feathers on the head and upper parts of the body. The blackish tail has a white tip, and barred outer feathers. The most spectacular feature is the brightly iridescent violet chin and upper breast. The belly is white with broad black, green or violet bars. Mature males also have a red eye-ring. The closely related species, C. amethystinus has a glossy blue-violet throat patch rather than reddish violet of this cuckoo. The females have mottled, greenish-bronze upper parts and