|
|
| Uranium | |
| Electron Configuration | 2,8,18,32,21,9,2 |
| Electron Configuration | [Rn] 5f3 6d1 7s2 |
| Ground state | (9/2,3/2)°2 |
| Atomic Volume | 12.59 g/cm3 |
| Electronegativity | 1.38 |
| Magnetic ordering | Paramagnetic |
| Mass magnetic susceptibility | 2.15 x 10-8 |
| Molar magnetic susceptibility | 5.118 x 10-9 |
| Speed of sound | 3155 m s-1 |
 Thermal Properties |
|
| Enthalpy of Atomization | 489.5 kJ mol-1 @25°C |
| Enthalpy of Fusion | 15.5 kJ mol-1 |
| Enthalpy of Vaporisation | 417.1 kJ mol-1 |
| Heat Capacity | 27.665 J mol-1 K-1 |
| Thermal Conductivity | 27.5 W m-1 K-1 |
| Thermal Expansion | 13.9 μm m-1 K-1 |
| Elastic Properties |
|
| Bulk modulus | 100 GPa |
| Poisson ratio | 0.23 |
| Shear modulus | 111 GPa |
| Young's modulus | 208 GPa |
| Electrical Properties |
|
| Electrical resistivity | 2.8 x 10-7 Ω m |
| Electrical conductivity | No data. |
| Chemical Properties |
|
| Electrochemical Equivalent | 1.4801 g Ah-1 |
| Electron Work Function | 3.63 eV |
| Valence Electron Potential (-eV) | 170 |
| Ionization Potential | |
 First
|
6.05 |
| Incompatibilities | Carbon dioxide (CO2), carbon tetrachloride (CCl4), nitric acid (HNO3), fluorine. |
| Flammability |
|
| Combustible Solid
|
| Energy Levels |
|
| Kα1 (intensity 0) |
98.439 KeV |
| Kα2 (intensity 0) |
94.665 KeV |
| Kβ1 (intensity 0) |
111.3 KeV |
| Lα1 (intensity 100) |
13.6147 KeV |
| Lα2 (intensity 10) |
13.4388 KeV |
| Lβ1 (intensity 38) |
17.22 KeV |
| Lβ2 (intensity 14) |
16.4283 KeV |
| Lβ3 (intensity 2) |
17.4509 KeV |
| Lβ4 (intensity 2) |
16.5737 KeV |
| Lγ1 (intensity 8) |
20.1671 KeV |
| Lγ2 (intensity 2.7) |
20.4821 KeV |
| Lγ3 (intensity 2) |
15.394 KeV |
| Ll (intensity 6) |
11.6196 KeV |
| Atomic Radii |
|
| Empirical
|
175 pm |
| Bohr Radius
|
No data. |
| Covalent Radius
|
No data. |
| Van der Waals
|
186 pm |
| Triple covalent
|
118 pm |
| Metallic
|
165 pm |
| Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 3 | VI | 1.165 | 1.025 | R |
| 4 | VI | 1.03 | 0.89 | |
| VII | 1.09 | 0.95 | E | |
| VIII | 1.14 | 1 | R* | |
| IX | 1.19 | 1.05 | ||
| XII | 1.31 | 1.17 | E | |
| 5 | VI | 0.9 | 0.76 | |
| VII | 0.98 | 0.84 | E | |
| 6 | II | 0.59 | 0.45 | |
| IV | 0.66 | 0.52 | ||
| VI | 0.87 | 0.73 | * | |
| VII | 0.95 | 0.81 | E | |
| VIII | 1 | 0.86 | ||
| R, From r3 vs V plots. |
| C, Calculated from bond length - bond strength equations. |
| E, Estimated. |
| *, Most Reliable. |
| M, From Metallic Oxides. |
| A, Ahrens (1952) Ionic radius. |
| P, Pauling's (1960) Crystal Radius. |
| Oxidation States |
|
| Main
|
U+6 |
| Other
|
U+2, U+3, U+4, U+5 |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
584 |
| M+ - M2+ |
1420 |
| Covalent Bonds (kJ mol-1) |
|
|
|
| Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 2325 | 2564 | 2859 | 3234 | 3727 | 4402 |
| Crystal Structure |
|
| Structure
|
Orthorhombic |
 |
a = 285.37 pm |
| b = 586.95 pm | |
| c = 495.48 pm | |
| α = 90° | |
| β = 90° | |
| γ = 90° | |