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92
U
238.029
Uranium |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| Name: Uranium | Symbol: U |
| Group: Rare Earth, Actinides | Atomic weight: 238.029 |
| Density @ 293 K: 18.9 g/cm3 | Atomic volume: 12.59 cm3/mol |
| Group: Rare Earth, Actinides | Discovered: 1789 |
States
| State (s, l, g): solid | |
| Melting point: 1405.2 K | Boiling point: 4203 K |
| Heat of fusion: 8.520 kJ/mol | Heat of vaporization: 477.0 kJ/mol |
Energies
| 1st ionization energy: 584 kJ/mole | |
| Electronegativity: 1.7 | 2nd ionization energy: kJ/mole |
| Electron affinity: kJ/mole | 3rd ionization energy: kJ/mole |
| Specific heat: 0.12 J/gK | Heat atomization: 490 kJ/mole atoms |
Oxidation & Electrons
| Shells: 2,8,18,32,21,9,2 | Electron configuration: [Rn] 5f3 6d1 7s2 |
| Minimum oxidation number: 0 | Maximum oxidation number: 6 |
| Min. common oxidation no.: 0 | Max. common oxidation no.: 6 |
Appearance & Characteristics
| Structure: hcp:hex cls pkd distorted | Color: silvery |
| Uses: nuclear reactor fuel | Toxicity: |
| Hardness: mohs | Characteristics: Radioactive |
Reactions
| Reaction with air: mild, => U3O8 | |
| Reaction with 6 M HCl: mild, => H2 | Reaction with 6 M HCl: mild, => H2 |
| Reaction with 15 M HNO3: passivated | Reaction with 6 M NaOH: none |
Other Forms
| Number of isotopes: 3 | Hydride(s): UH3 |
| Oxide(s): UO UO2 U2O5 U3O8 UO3 | Chloride(s): UCl3 UCl4 UCl5 UCl6 |
Radius
| Ionic radius (2- ion): pm | Ionic radius (1- ion): pm |
| Atomic radius: 156 pm | Ionic radius (1+ ion): pm |
| Ionic radius (2+ ion): pm | Ionic radius (3+ ion): 116.5 pm |
Conductivity
| Thermal conductivity: 27.5 J/m-sec-deg | |
| Electrical conductivity: 33.333 1/mohm-cm | Polarizability: 27.4 A^3 |
Abundance
| Source: Uranite (oxide) | |
| Rel. abund. solar system: -2.046 log | Abundance earth's crust: 0.4 log |
| cost, pure: $/100g | cost, bulk: $/100g |
