92U238.03
Uranium (U)
Element 92 · Actinide
Uranium (U) is a chemical element with atomic number 92. It is classified as an actinide in period 7 of the periodic table (the f-block). Its standard atomic weight is 238.03 u and its ground-state electron configuration is [Rn] 5f³ 6d¹ 7s².
Uranium facts
| Atomic number (Z) | 92 |
|---|---|
| Symbol | U |
| Standard atomic weight | 238.03 u |
| Category | Actinide |
| Group | — (f-block) |
| Period | 7 |
| Block | f-block |
| Electron configuration | [Rn] 5f³ 6d¹ 7s² |
| Electronegativity (Pauling) | 1.38 |
| State at 20 °C | Solid |
| Protons / electrons | 92 / 92 |
| Neutrons (most common isotope, approx.) | 146 |
| Molar mass | 238.03 g/mol |