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Uranium (U)
Atomic number 92 · Actinide
| Atomic number | 92 |
|---|---|
| Atomic mass | 238.02891 u |
| Molar mass | 238.02891 g/mol |
| Category | Actinide |
| Group / period / block | — / 7 / f |
| Electron configuration | [Rn] 5f3 6d 7s2 |
| Electrons per shell | 2, 8, 18, 32, 21, 9, 2 |
| Electronegativity (Pauling) | 1.7 |
| Atomic radius | 175.0 pm |
| Density | 19.1 g/cm³ |
| First ionisation energy | 6.194 eV |
| Melting point | 1408.15 K (1135.00 °C) |
| Boiling point | 4404.15 K (4131.00 °C) |
| Common oxidation states | +6 |
| Abundance in Earth's crust | 2.7 ppm |
Uses
Fuel for nuclear power stations
Discovery
1789, Martin Klaproth