Shells: 2, 8, 18, 32, 21, 9, 2
Orbitals: [Rn] 5f 3 6d 1 7s 2
Electronegativity: --, 1.2
1. Ionization potential: 6.1941 eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: 6, 5, 4, 3
Electrical conductivity: 0.0380 10^6
Melting point: 1132 °C
Boiling point: 3818 °C
Specific heat: 0.12 J/gK
Heat of fusion: 8.520 kJ/mol
Heat of vaporization: 477.0 kJ/mol
Thermal conductivity: 0.276 W/cmK
Atomic radius: -- Å
Ionic radius: 0.81 Å (+6)
Covalent radius: 1.42 Å
Atomic volume: 12.59 cm³/mol
Density (293 K): 18.9 g/cm³
Crystal structure: orthorhombic
| Nuclide | Abundance [%] | Mass | Spin | Halflife | Decay mode | Decay tree |
|---|---|---|---|---|---|---|
| 230 U | 0 | 230 | 0 | 20.8d | α | View |
| 231 U | 0 | 231 | 5/2 | 4.20d | EC | View |
| 232 U | 0 | 232.037 | 0 | 70y | α, SF | View |
| 233 U | 0 | 233.04 | 5/2 | 1.59E05y | α, SF | View |
| 234 U | 0.0055 | 234.041 | 0 | 2.47E05y | α, SF | View |
| 235 U | 0.72 | 235.044 | 7/2 | 7.04E08y | α, SF | View |
| 236 U | 0 | 236.046 | 0 | 2.34E07y | α, SF | View |
| 237 U | 0 | 237 | 1/2 | 6.75d | β- | View |
| 238 U | 99.27 | 238.051 | 0 | 4.47E09y | α, SF | View |
| 239 U | 0 | 239 | 5/2 | 23.5m | β- | View |
| 240 U | 0 | 240 | 0 | 14.1h | β- | View |
| Name origin: | Named for the planet Uranus. |
| Description: | Silvery-white, dense, ductile, malleable, radioactive metal. |
| Discovered by: | Martin Klaproth |
| Year: | 1789 |
| Place: | Germany |
| Sources: | Occurs in many rocks, but in large amounts only in such minerals as pitchblende and carnotite. |
| Use(s): | For many centuries it was used as a pigment for glass. Now it is used as a fuel in nuclear reactors and in bombs. |
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