92 U
Actinide
Uranium
Fuel for reactors.
Properties of Uranium
- Atomic number (Z)
- 92
- Symbol
- U
- Atomic mass
- 238.03 g/mol
- Category
- Actinide
- Group
- 3
- Period
- 7
- Electron configuration
- [Rn] 5f³ 6d¹ 7s²
- Electronegativity (Pauling)
- 1.38
- Atomic radius
- 175 pm
- First ionization energy
- 598 kJ/mol
- Melting point
- 1405.3 K (1132.2 °C)
- Boiling point
- 4404 K (4130.9 °C)
- Density
- 18.95 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1789