U
Uranium Symbol (U)
Uranium is element 92 of the periodic table. Copy its symbol U and see its atomic weight, electron configuration and common compounds.
What does U mean?
U is the chemical symbol for uranium, element number 92 in the periodic table. Uranium is an actinide in the f-block, period 7. It is a heavy radioactive metal used as fuel in nuclear reactors.
Codes and properties
| Chemical symbol | U |
|---|---|
| Atomic number (Z) | 92 |
| Atomic weight (PubChem) | 238.0289 |
| Group / period | f-block / 7 |
| Element category | actinide |
| Electron configuration | [Rn]7s² 5f³ 6d¹ |
| State at 20 °C | Solid |
| Oxidation states | +6, +5, +4, +3 |
| Electronegativity (Pauling) | 1.38 |
| Melting point | 1408 K (1134.85 °C) |
| Boiling point | 4404 K (4130.85 °C) |
| Density | 18.95 g/cm³ |
| Discovered | 1789 |
| Common compounds | UO₂, UF₆ |
How to type U
- Plain text: type
U— element symbols are ordinary Latin letters, with the first letter capitalised. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as UO₂ — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{U}in math mode, or use the mhchem package:\ce{U}. - HTML:
U; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for uranium?
The chemical symbol for uranium is U.
What is the atomic number of uranium?
Uranium has atomic number 92, meaning each atom has 92 protons.
What is the electron configuration of uranium?
The ground-state electron configuration of uranium is [Rn]7s² 5f³ 6d¹.
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Reference: Uranium on PubChem (NIH)