Holmium oxide 2400 / kg 
 Element symbols: Ho 
 English Name: Holmium 
 Location: Inner Mongolia 
 Chinese Name: Ho 
 Relative Atomic Mass: 164.93 
 Common valence: +3 
 Electronegativity: 1.23 
 External electronic arrangement: 4f11 6s2 
 Extranuclear arrangement: 2,8,18,29,8,2 
 Isotope and radiation: Ho-163 [4570y] Ho-165 Ho-166 [1.1d] 
 Electron affinity and energy: 0 of KJ · mol-1 
 The first ionization energy: 581 KJ mol-1 
 The second ionization energy: 1139 KJ mol-1 
 The third ionization energy: 0 of KJ · mol-1 
 Elemental density: 8.54 g/cm3 
 Elemental melting point: 1470.0 ° C 
 Elemental Boiling Point: 2720.0 ° C 
 Atomic radius: 2.47 ? 
 Ion radius: Aye 
 Covalent radius: 1.58 ? 
 Common compounds: 
 Found by: Cliff: 1878 
 Location: Switzerland 
 Name origin: named after the Latin name of the Swedish capital of Stockholm "Holmia. 
 Elements: very soft and full of shiny silver-white metal, malleable. 
 Elements: silicon beryllium yttrium ore. Most of monazite sand from the 50% of rare earth elements, which the holmium generally accounted for 0.05%. 
 Grades [Ho2O3-2] [Ho2O3-3] 
 Of REO min,% 99.0 99.0 
 Ho2O3/REO min% 99.90 99.5 
 Rare earth impurities / REORE impurities / REOmax% Tb4O7 0.0100 0.0400 
 Of Dy2O3 0.0200 0.1000 
 Of Er2O3 0.0500 0.3000 
 Tr2O3 0.0100 0.0300 
 Of Y2O3 .0100 .0300 

 Non-rare earth impurities Non-RE impuritiesmax% Fe2O3 0.0010 0.0010 
 Of SiO .0050 0.0050 
 Of CaO .0150 .0200 
 CI - 0.0500 0.0500 
 Loss on ignition 1000 ° C, 1h, max,% 
 Loss on ignition at 1000 ° C, 1h, max% 1.0 1.0