92 U 238.03
Uranium
Actinide
Uranium (U) is a chemical element with atomic number 92, classified as a actinide. At room temperature it is a solid. It was discovered in 1789 by Martin Heinrich Klaproth.
Properties
- Atomic number
- 92
- Atomic mass
- 238.03 u
- Category
- Actinide
- Group
- 0
- Period
- 7
- Block
- f-block
- Electron configuration
- [Rn] 5f³ 6d¹ 7s²
- Phase at STP
- Solid
- Density
- 18.95 g/cm³
- Melting point
- 1405.3 K (1132.2 °C)
- Boiling point
- 4404 K (4130.9 °C)
- Electronegativity
- 1.38
- Atomic radius
- 240 pm
- Ionization energy
- 6.194 eV
- Discovery
- 1789 · Martin Heinrich Klaproth
Common uses
Nuclear power, weapons, dating rocks, glass coloring
Did you know?
Main fuel for nuclear power and naturally radioactive.
Compounds you can make with uranium
Uranium appears in 2 compounds in our periodic table sandbox. Each one is a real substance with its true chemical formula — combine the right elements in the right ratio below to discover it.
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UF6
Uranium Hexafluoride
The volatile uranium compound fed into centrifuges to enrich nuclear fuel.
-
UO2
Uranium Dioxide
The black ceramic pressed into the fuel pellets that power nuclear reactors.