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Uranium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| U | 92 | 238.02891 | 1132.2 °C | 4131 °C | Solid | 19.1 g/cm3 | Metal   |
|
|
|
| General |
| Name, symbol, number |
uranium, U, 92 |
| Chemical series |
actinides |
| Group, period, block |
n/a, 7, f |
| Appearance |
silvery gray metallic;
corrodes to a spalling
black oxide coat in air
 |
| Standard atomic weight |
238.02891(3) g·mol−1 |
| Electron configuration |
[Rn] 5f3 6d1 7s2 |
| Electrons per shell |
2, 8, 18, 32, 21, 9, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
19.1 g·cm−3 |
| Liquid density at m.p. |
17.3 g·cm−3 |
| Melting point |
1405.3 K
(1132.2 °C, 2070 °F) |
| Boiling point |
4404 K
(4131 °C, 7468 °F) |
| Heat of fusion |
9.14 kJ·mol−1 |
| Heat of vaporization |
417.1 kJ·mol−1 |
| Heat capacity |
(25 °C) 27.665 J·mol−1·K−1 |
Vapor pressure
| P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T/K |
2325 |
2564 |
2859 |
3234 |
3727 |
4402 |
|
| Atomic properties |
| Crystal structure |
orthorhombic |
| Oxidation states |
3+,4+,5+,6+[57]
(weakly basic oxide) |
| Electronegativity |
1.38 (Pauling scale) |
| Ionization energies |
1st: 597.6 kJ/mol |
| 2nd: 1420 kJ/mol |
| Atomic radius |
175 pm |
| Van der Waals radius |
186 pm |
| Miscellaneous |
| Magnetic ordering |
paramagnetic |
| Electrical resistivity |
(0 °C) 0.280 µΩ·m |
| Thermal conductivity |
(300 K) 27.5 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 13.9 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 3155 m/s |
| Young's modulus |
208 GPa |
| Shear modulus |
111 GPa |
| Bulk modulus |
100 GPa |
| Poisson ratio |
0.23 |
| CAS registry number |
7440-61-1 |
| Selected isotopes |
|
|
| References |
|
Uranium Compounds
|
Source: Wikipedia article Uranium
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Chemistry Quick Facts
