Uranium Oxide, di-UO2

Uranium Oxide, di-UO2
uranium (IV) oxide


 Uranium Oxide, di-UO2

  • Formula as commonly written: UO2
  • Hill system formula: O2U1
  • CAS registry number: [1344-57-6]
  • Formula weight: 270.028
  • Class: oxide


  • uranium (IV) oxide
  • uranium dioxide
  • uranium oxide
  • pitchblende

Physical properties

  • Colour: dark brown
  • Appearance: crystalline solid
  • Melting point: 2827°C
  • Boiling point:
  • Density: 10970 kg m-3


IBI Labs

Element analysis and oxidation numbers

For each compound, and where possible, a formal oxidation number for each element is given, but the usefulness of this number is limited, especially so for p-block elements in particular. Based upon that oxidation number, an electronic configuration is also given but note that for more exotic compounds you should view this as a guide only.

Element % Formal oxidation state Formal electronic configuration
O 11.85 -2 [He].2s2.2p6
U 88.15 4 [Rn].5f2


Not available

Solid state structure

  • Geometry of uranium:
  • Prototypical structure:


Isotope pattern

What follows is the calculated isotope pattern for the UO2 unit with the most intense ion set to 100%.

Formula: U1O2

mass  %266   0.0 267   0.7 268   0.0 269   0.0 270 100.0 271   0.1 272   0.4



CAS # Formula Formula Weight
1344-57-6 UO2 270.07
Color Crystalline Form Specific Gravity Melting Point Boiling Point
brn-blk, cub 10.97 2827 ……..
Solubility in 100 parts
Cold Water Hot Water Other Reagents
s HNO3



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