[no1]

uranium (V, VI) oxide
• Formula as commonly written: U3O8
• Hill system formula: O8U3
• CAS registry number: [1344-59-8]
• Formula weight: 842.082
• Class: oxide
Synonyms
• uranium (V, VI) oxide
• uranium oxide
• pitchblende
• triuranium octaoxide
Physical properties
• Colour: very dark green-black
• Appearance:
• Melting point: 1150°C; 1300°C (decomposes to UO2)
• Boiling point:
• Density: 8380 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 15.20 -2 [He].2s2.2p6
U 84.80
Synthesis
Not available
Solid state structure
• Geometry of uranium: 7 coordinate: pentagonal bipyramidal
• Prototypical structure:



Isotope pattern
What follows is the calculated isotope pattern for the U3O8 unit with the most intense ion set to 100%.
Formula: U3O8
mass %
836 0.0
837 0.0
838 0.0
839 2.2
840 0.0
841 0.0
842 100.0
843 0.3
844 1.6
845 0.0
846 0.0