Who first isolated praseodymium in 1931? To date, I've been unable to find a single source that consistently provides names and years or both for the first isolation of every element. Thus far I've names and years of the first recorded isolations of each element up to praseodymium (carbon, sulfur, iron, copper, silver and tin notwithstanding). But I've hit a wall and all I can find is a year. Now I see the same problem with neodymium, that apparently was isolated in 1925. So who first isolated neodymium in 1925? Promethium was first isolated by Jacob Marinsky, Lawrence Glendenin and Charles Coryell of America in 1945. O.K, but what about samarium, europium and gadolinium, etc. In addition, if anybody can provide a source such as "the history of pure elements" (which isn't a real source), I for one would be grateful. By the way, technetium was first isolated in the Belgian Congo by B.T. Kenna and P.K. Kuroda in 1962. This was a pain to find and I don't know anything else about these two as I suppose wiki didn't think being the first to isolate a rare element is worthy of a wiki page. Thank you.