• Class: AcTinides
• Period: 7
• IUPAC group: 3
• Traditional: IIIa

• Discovered in: 1789 by Klaproth
• Origin of name: The planet Uranus
• Historical or alternate name:

Pitchblende, uraninite, carnotite, autunite, uranophane, & tobernite

Silvery, ductile, malleable metal. Resists alkalis; tarnishes in air; attacked by steam and acids.

• Atmosphere: ~0.0 ppm
• Primitive mantle: 0.018 ppm
• Sea water: 0.003 ppm
• Metallic meteorite: 0.0081 ppm
• ConTinental crust: 0.91 ppm
• Solar photosphere: <0.60 log of abundance
• Oceanic crust: 0.010 ppm
• Solar system: 0.009 relative to Si=1.0e6

   Hazards

Poison. Radiotoxic. Compounds highly toxic. Cumulative effects. Flammable solid. Reacts violently with air and water..

• Lower:
• Upper:0.01

Uranium Physical Properties

 Transitional Data

• State: Solid
• Density: 19.05 g/cm3

 Molar enthalpy

• Atomization: 535.43 kJ mol-1
• Fusion: 15.5 kJ mol-1
• Vaporization: 417.1 kJ mol-1

 Transition points

• MelTing point: 1405.5 K
• Boiling point: 4091.0 K
• Critical temperature: 12500.0 K

 Molar properties

• Atomic weight: 238.0289 g/mole
• Molar volume: 12.572 cm3 mol-1

 Crystal structure sequence

orthorhombic <935 K < complex-tetragonal < 1045 K < body-centered-cubic < melTing point

 Thermodynamics

• State: solid
  • Enthalpy 0
  • Gibbs function 0
  • Entropy 50.21
  • Heat Capacity 27.665

• State: gas
  • Enthalpy 535.6
  • Gibbs function 491.2
  • Entropy 199.77
  • Heat Capacity 23.694

 Miscellaneous physical

• Electrical resistivity: 30.0 µ-ohms/cm
• Debye temperature: 207.0 K
• Thermal conductivity: 27.6 W / m / K
• Coefficient of linear expansion: 14.0Coef. per K
• Mass magnetic susceptibility: 2.16e-8
• X-ray diffraction mass absorption coefficients:
• CuK: 352 (µ/p)/cm2 g-1
• MoK: 153 (µ/p)/cm2 g-1

Uranium Chemical Properties

 Chemical basics:

• Oxidation states: +3 +4 +5 +6
• Molecular wt: 238.0289 g/mole

 Radii

• Covalent: pm
• Atomic: 156.0 pm
• Van der Waals: pm

 Ions:

• ion: +3 pm 102.5
• ion: +4 pm 89.0
• ion: +5 pm 76.0
• ion: +6 pm 73.0

 Covalent bonds

 Effective nuclear charge

• Slater: 1.80
• Clementi:
• Froese-Fischer:

 Electronegativity

• Pauling: 1.4
• Allred-Rochow: 1.22

 Standard reactions

Uranium Nuclear Properties

• Known 15
• Listed 8

• Known 227 - 240
• Listed 230 - 238

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 20.800 days
  • Decay mode: alpha,
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 70.000 years
  • Decay mode: alpha, S.F.
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 5/2
• Radioisotopes:
  • Half-life: 0.159 E6 years
  • Decay mode: alpha,
  • Source:
• Notes

• % Occ.:Natural 0.0055%
• Mossbauer NRA: 6.97
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 0.248 E6 years
  • Decay mode: alpha, S.F.
  • Source:
• Notes

• % Occ.:Natural 0.7200%
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 7/2
• Radioisotopes:
  • Half-life: 0.713 E9 years
  • Decay mode: alpha, S.F.
  • Source:
• Notes date

• % Occ.:Natural
• Mossbauer NRA: 7.24
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 23.420 E6 years
  • Decay mode: alpha, S.F.
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 6.750 days
  • Decay mode: Beta-
  • Source:
• Notes

• % Occ.:Natural 99.2745%
• Mossbauer NRA: 7.16 *
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 4.490 E9 years
  • Decay mode: alpha, S.F.
  • Source:
• Notes date

• Isotope Cross-section 7.60±0.07 barns

• Absolute sensitivity: 8.71e-7 1H=1.0
• Relative sensitivity: 1.21e-4 1H=1.0
• Receptivity: 5.4e-3 13C=1.0
• Magnetogyric ratio: -0.4926e7 rad / T / s
• Quadropole moment: 4.55e-28 m2
• Frequency: 1.790 MHz
• Reference: UF6

Uranium Energy Properties

Electrons

• Ground state electron configuration: [Rn] 5f3 6d1 7s2
• Electron affinity: kJ mol-1
• Filling orbitals:

Spectral lines

 Ionization energies

 Atomic energy levels