[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

[no1]

uranium (VI) chloride
• Formula as commonly written: UCl6
• Hill system formula: Cl6U1
• CAS registry number: [13763-23-0]
• Formula weight: 450.745
• Class: chloride
Synonyms
• uranium (VI) chloride
• uranium chloride
• uranium hexachloride
Physical properties
• Colour: dark green
• Appearance: crystalline solid
• Melting point: 177°C
• Boiling point: 75°C
• Density: 3600 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
Cl 47.19 -1 [Ne].3s2.3p6
U 52.81 6 [Rn]
Synthesis
Not available
Solid state structure
• Geometry of uranium: 6 coordinate: octahedral
• Prototypical structure:



Isotope pattern
What follows is the calculated isotope pattern for the UCl6 unit with the most intense ion set to 100%.
Formula: U1Cl6
mass %
444 0.0
445 0.4
446 0.0
447 0.7
448 52.1
449 0.6
450 100.0
451 0.2
452 80.0
453 0.1
454 34.1
455 0.0
456 8.2
457 0.0
458 1.0
459 0.0
460 0.1

[no1]

uranium (VI) fluoride
• Formula as commonly written: UF6
• Hill system formula: F6U1
• CAS registry number: [7783-81-5]
• Formula weight: 352.019
• Class: fluoride
Synonyms
• uranium (VI) fluoride
• uranium fluoride
• uranium hexafluoride
Physical properties
• Colour: white
• Appearance: crystalline solid
• Melting point: 64°C (triple point)
• Boiling point: 56.5°C
• Density: 5090 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
F 32.38 -1 [He].2s2.2p6
U 67.62 6 [Rn]
Synthesis
Not available
Solid state structure
• Geometry of uranium: 6 coordinate: octahedral
• Prototypical structure:



Isotope pattern
What follows is the calculated isotope pattern for the UF6 unit with the most intense ion set to 100%.
Formula: U1F6
mass %
348 0.0
349 0.7
350 0.0
351 0.0
352 100.0

[no1]

uranium nitride
• Formula as commonly written: U3N2
• Hill system formula: N2U3
• CAS registry number: [12033-85-1]
• Formula weight: 742.1
• Class: nitride
Synonyms
• uranium nitride
• uranium(II) nitride
• diuranium trinitride
Physical properties
• Colour: dark grey
• Appearance: crystalline solid
• Melting point: 900°C (decomposes to UN)
• Boiling point:
• Density:
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
N 3.77 -3 [He].2s2.2p6
U 96.23 2 [Rn].5f4
Synthesis
Not available
Isotope pattern
What follows is the calculated isotope pattern for the U3N2 unit with the most intense ion set to 100%.
Formula: U3N2
mass %
736 0.0
737 0.0
738 0.0
739 2.2
740 0.0
741 0.0
742 100.0
743 0.7
744 0.0

[no1]

uranium oxide
• Formula as commonly written: U3O7
• Hill system formula: O7U3
• CAS registry number: [12037-04-6]
• Formula weight: 826.082
• Class: oxide
Synonyms
• uranium oxide
• triuranium heptoxide
Physical properties
• Colour:
• Appearance:
• Melting point:
• Boiling point:
• Density:
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 13.56
U 86.44
Synthesis
Not available
Isotope pattern
What follows is the calculated isotope pattern for the U3O7 unit with the most intense ion set to 100%.
Formula: U3O7
mass %
820 0.0
821 0.0
822 0.0
823 2.2
824 0.0
825 0.0
826 100.0
827 0.3
828 1.4
829 0.0
830 0.0

[no1]

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[no1]

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[no1]

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