HHomeBackground Color:He
LiBeUranium Main PageBlack White GrayBCNOFNe
NaMgUranium Pictures PageAlSiPSClAr
KCaUranium Isotope DataScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe
CsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRn
FrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMcLvTsOg

Technical data for Uranium

Click any property name to see plots of that property for all the elements.

Overview
NameUranium
SymbolU
Atomic Number92
Atomic Weight238.02891
Density19.05 g/cm3
Melting Point1135 °C
Boiling Point3927 °C

Thermal properties
PhaseSolid
Melting Point1135 °C
Boiling Point3927 °C
Absolute Melting Point1408 K
Absolute Boiling Point4200 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion14 kJ/mol
Heat of Vaporization420 kJ/mol
Specific Heat116 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity27 W/(m K)
Thermal Expansion0.0000139 K-1

Bulk physical properties
Density19.05 g/cm3
Density (Liquid)17.3 g/cm3
Molar Volume0.000012495
Brinell Hardness2400 MPa
Mohs Hardness6
Vickers Hardness1960 MPa
Bulk Modulus100 GPa
Shear Modulus111 GPa
Young Modulus208 GPa
Poisson Ratio0.23
Refractive IndexN/A
Speed of Sound3155 m/s
Thermal Conductivity27 W/(m K)
Thermal Expansion0.0000139 K-1

Reactivity
Valence6
Electronegativity1.38
ElectronAffinityN/A
Ionization Energies
597.6, 1420 kJ/mol

Health and Safety
DOT Hazard Class
7
DOT Numbers2979
RTECS Number
RTECSYR3490000
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockf
GroupN/A
Period7
SeriesActinide
Electron Configuration[Rn]7s25f36d1
ColorSilver
Discovery
1789 in Germany
Gas phaseN/A
CAS NumberCAS7440-61-1
CID Number
CID23989
RTECS Number
RTECSYR3490000

Electrical properties
Electrical TypeConductor
Electrical Conductivity3.6×106 S/m
Resistivity2.8×10-7 m Ω
Superconducting Point0.69

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility2.16×10-8 m3/Kg
Molar Magnetic Susceptibility5.14×10-9 m3/mol
Volume Magnetic Susceptibility0.000411

Abundances
% in Universe2×10-8%
% in Sun1×10-7%
% in Meteorites9.8×10-7%
% in Earth's Crust0.00018%
% in Oceans3.3×10-7%
% in Humans1×10-7%

Atomic dimensions and structure
Atomic RadiusN/A
Covalent Radius196 pm
Van der Waals Radius186 pm
Crystal StructureBase Orthorhombic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
285.37, 586.95, 495.48 pm
Space Group NameCmcm
Space Group Number63

Nuclear Properties
Half-Life4.471080669711×109 y
Lifetime6.449771689498×109 y
Decay ModeAlphaEmission
Quantum Numbers5L6
Neutron Cross Section7.57
Neutron Mass Absorption0.0005
Known Isotopes
217U, 218U, 219U, 220U, 221U, 222U, 223U, 224U, 225U, 226U, 227U, 228U, 229U, 230U, 231U, 232U, 233U, 234U, 235U, 236U, 237U, 238U, 239U, 240U, 241U, 242U
Stable Isotopes
None
Isotopic Abundances
234U0.0055%
235U0.72%
238U99.2745%


Notes on the properties of Uranium:

Specific Heat: Value given for solid phase.

Up to date, curated data provided by Mathematica's ElementData function from Wolfram Research, Inc.

The Elements book Mad Science book Periodic Table Poster  Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here!