[no1]

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