Praseodymium is a chemical element with the symbol Pr and the atomic number 59. It is the third member of the lanthanide series and is considered to be one of the rare-earth metals. It is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties.It is too reactive to be found in native form, and pure praseodymium metal slowly develops a green oxide coating when exposed to air.Like most rare-earth elements, praseodymium most readily forms the +3 oxidation state, which is the only stable state in aqueous solution, although the +4 oxidation state is known in some solid compounds and, uniquely among the lanthanides, the +5 oxidation state is attainable in matrix-isolation conditions.The 0, +1, and +2 oxidation states are rarely found. Aqueous praseodymium ions are yellowish-green, and similarly, praseodymium results in various shades of yellow-green when incorporated into glasses.  Many of praseodymium's industrial uses involve its ability to filter yellow light from light sources.ATT provides Praseodymium and compounds at a competitive price, including Praseodymium Acetate, Praseodymium Carbonate, Praseodymium Chloride, Praseodymium Fluoride, Praseodymium Hydroxide, Praseodymium Metal, Praseodymium Nitrate, Praseodymium Oxalate, Praseodymium Oxide, Praseodymium Sulfate