Element Uranium
It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons.
Uranium is a chemical element with the symbol U and atomic number 92.
Names and Identifiers
| Chemical Formula: | U |
| CAS: | 7440-61-1 |
| Molecular Weight: | 238.02900 g/mol |
| EC Number : | n/a |
| MDL Number: | n/a |
| Color: | metallic gray/ silvery-white |
| Other Names: | D’uranium, Uran, Uranio |
| PubChem CID: | 23989 |
| IUPAC Name: | Uranium |
| Inchl: | InChI=1S/U |
| InChI Key: | JFALSRSLKYAFGM-UHFFFAOYSA-N |
| Canonical SMILES: | [U] |
| ICSC Number: | n/a |
Physical & Chemical Properties
| Phase: | Solid |
| Density: | 19.1g/cm³ |
| Boiling Point: | 4404 K (4131 °C, 7468 °F) |
| Melting Point: | 1405.3 K (1132.2 °C, 2070 °F) |
| Molecular Formula: | U |
| Flash Point: | n/a |
| Exact Mass: | 238.05100 |
| Symbol: |  |
| Signal Word: | Warning |
| Hazard Statements: | H315-H319 |
| Precautionary Statements: | n/a |
| Hazard Codes: | Xi |
| Risk Phrases: | 36-38 |
| Safety Phrases: | 26 |
| RIDADR: | n/a |
| WGK Germany: | 1 |
| RTECS: | n/a |
| Packaging Group: | n/a |
| Hazard Class: | n/a |
Natural uranium consists of three major isotopes: uranium-238 (99.28% natural abundance), uranium-235 (0.71%), and uranium-234 (0.0054%).
Naturally occurring isotopes
| Isotope | Mass/Da | Natural abundance (atom %) | Nuclear spin (I) | Magnetic moment (μ/μN) |
|---|---|---|---|---|
| 234U | 234.0409468 (24) | [0.0055 (2)] | 0 | 0 |
| 235U | 235.0439242 (24) | [0.7200 (51)] | 7/2 | -0.35 |
| 238U | 238.0507847 (23) | [99.2745 (106)] | 0 | 0 |
Radiosotope data
| Isotope | Mass/Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 230U | 230.03393 | 20.8 d | α to 226Th | 0 | |
| 231U | 231.03626 | 4.2 d | α to 227Th | 5/2 | |
| 232U | 232.03715 | 68.9 y | α to 228Th | 0 | |
| 233U | 233.039628 | 1.59 x 105 y | α to 229Th; SF | 5/2 | 0.59 |
| 234U | 234.0409468 (24) | 2.45 x 105 y | α to 230Th; SF | 0 | |
| 235U | 235.0439242 (24) | 7.04 x 108 y | α to 231Th; SF | 7/2 | 0.38 |
| 236U | 236.045561 | 2.34 x 107 y | α to 232Th; SF | 0 | |
| 237U | 237.048723 | 6.75 d | β– to 237Np | 1/2 | |
| 238U | 238.0507847 (23) | 4.46 x 109 y | α to 234Th; SF | 0 |