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92
U
238.03
Uranium
Actinides · Group 6 · Period 6–7 (f)
Atomic properties
| Atomic number | 92 |
|---|---|
| Symbol | U |
| Standard atomic weight | 238.03 |
| Classification | Actinides |
| Group | f-block series |
| Period | 7 |
| Block | f-block (actinide) |
| Electron configuration | [Rn] 5f3 6d1 7s2 |
| Electronegativity (Pauling) | 1.38 |
| Common oxidation states | +6, +4 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 19.1 g/cm³ |
| Melting point | 1132.2 °C |
| Boiling point | 4131 °C |
| Discovered | 1789 |
| CAS number | — |