Definition of ETHNOMEDICINE. : the comparative study of how different cultures view disease and how they treat or prevent it; also: the medical beliefs and practices of indigenous cultures.
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.
A simple Google search would have sufficed. Number of elements in most of the periodic tables is 118 due to the perfect symmetry. However,the last properly named element is Copernicum which has atomic number of 112. The rest of the elements are just tentatively named. They will be properly named once there existence is properly proved.