Holmium is a chemical element with the symbol Ho and atomic number 67.    It is a rare-earth element and the eleventh member of the lanthanide series. It is a relatively soft, silvery, fairly corrosion-resistant and malleable metal.    Like a lot of other lanthanides, holmium is too reactive to be found in native form, as pure holmium slowly forms a yellowish oxide coating when exposed to air. When isolated, holmium is relatively stable in dry air at room temperature.    However, it reacts with water and corrodes readily, and also burns in air when heated. Trivalent holmium ions have fluorescent properties similar to many other rare-earth ions (while yielding their own set of unique emission light lines), and thus are used in the same way as some other rare earths in certain laser and glass-colorant applications.Holmium has the highest magnetic permeability and magnetic saturation of any element and is thus used for the pole pieces of the strongest static magnets.    Because holmium strongly absorbs neutrons, it is also used as a burnable poison in nuclear reactors.ATT provides Holmium and compounds at a competitive price, including Holmium Acetate, Holmium Carbonate, Holmium Chloride, Holmium Fluoride, Holmium Hydroxide, Holmium Metal, Holmium Nitrate, Holmium Oxalate, Holmium Oxide, Holmium Sulfate