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Uranium

Metal radioactivesolid
Symbol: U
Atomic number: 92
Atomic mass: 238.0289
Group: Actinide
CAS-number: 7440-61-1

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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 21, 9, 2
Orbitals: [Rn] 5f3 6d1 7s2
Electronegativity: --, 1.2
1. Ionization potential: 6.1941 eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: 6, 5, 4, 3
Electrical conductivity: 0.0380 10^6
Melting point: 1132 °C
Boiling point: 3818 °C
Specific heat: 0.12 J/gK
Heat of fusion: 8.520 kJ/mol
Heat of vaporization: 477.0 kJ/mol
Thermal conductivity: 0.276 W/cmK
Atomic radius: -- Å
Ionic radius: 0.81 Å (+6)
Covalent radius: 1.42 Å
Atomic volume: 12.59 cm³/mol
Density (293 K): 18.9 g/cm³
Crystal structure: orthorhombic
orthorhombic

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
230U 0 230 0 20.8d α View
231U 0 231 5/2 4.20d EC View
232U 0 232.037 0 70y α, SF View
233U 0 233.04 5/2 1.59E05y α, SF View
234U 0.0055 234.041 0 2.47E05y α, SF View
235U 0.72 235.044 7/2 7.04E08y α, SF View
236U 0 236.046 0 2.34E07y α, SF View
237U 0 237 1/2 6.75d β- View
238U 99.27 238.051 0 4.47E09y α, SF View
239U 0 239 5/2 23.5m β- View
240U 0 240 0 14.1h β- View

Other info

Name origin:Named for the planet Uranus.
Description:Silvery-white, dense, ductile, malleable, radioactive metal.
Discovered by:Martin Klaproth
Year:1789
Place:Germany
Sources:Occurs in many rocks, but in large amounts only in such minerals as pitchblende and carnotite.
Use(s):For many centuries it was used as a pigment for glass. Now it is used as a fuel in nuclear reactors and in bombs.