[no1]

uranium (VI) oxide
• Formula as commonly written: UO3
• Hill system formula: O3U1
• CAS registry number: [1344-58-7]
• Formula weight: 286.027
• Class: oxide
Synonyms
• uranium (VI) oxide
• uranium oxide
• uranium trioxide
Physical properties
• Colour: orange-yellow
• Appearance: crystalline solid
• Melting point: (decomposes to U3O8)
• Boiling point:
• Density: 7300 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 16.78 -2 [He].2s2.2p6
U 83.22 6 [Rn]
Synthesis
Not available
Solid state structure
• Geometry of uranium:
• Prototypical structure:



Isotope pattern
What follows is the calculated isotope pattern for the UO3 unit with the most intense ion set to 100%.
Formula: U1O3
mass %
282 0.0
283 0.7
284 0.0
285 0.0
286 100.0
287 0.1
288 0.6