Praseodymium is a rare earth metal that is part of the lanthanide series in the periodic table. It has a relatively low melting point and is fairly reactive, but it forms a protective oxide layer that helps prevent further oxidation. Praseodymium is used in alloys with other metals to improve their strength and corrosion resistance, and it is also used as a catalyst in various chemical reactions. One of its most important uses is in the production of glass for goggles and lenses, where it helps absorb harmful ultraviolet radiation.