Term: praseodymium (Pr)
Literally meaning: “pertaining to green twin ”
The element called praseodymium because it was isolated from material named “didymium” and forms greenish-brown salts.
In 1882 Bohuslav Brauner announced that “didymium” incorrectly was said by Carl Mosander to be a new element (1841). In 1885 Baron Carl Auer Welsbach (1858-1929) recognized that “didymium” was consisted of two new elements: praseodimium and neodymium. Welsbach reacted “didymium” to form greenish-brown praseodymium and pink neodymium salts.
The element Praseodymium is a chemical element with atomic number 59 and atomic mass 140.90765. It is used mainly for coloring glass and ceramics.