Uranium Dioxide

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

Suppliers

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
11.85	-2	[He].2s2.2p6
U	88.15	4	[Rn].5f2

Synthesis

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

HNO₃

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