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Technical data for Uranium

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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 Point4.2×103 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion14 kJ/mol
Heat of Vaporization420 kJ/mol
Heat of CombustionN/A
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 Hardness2.4×103 MPa
Mohs Hardness6 MPa
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
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A
DOT Hazard Class7
DOT Numbers2979
EU NumberEU231-170-6
NFPA Fire RatingN/A
NFPA HazardsN/A
NFPA Health RatingN/A
NFPA Reactivity RatingN/A
RTECS NumberRTECSYR3490000
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockf
GroupN/A
Period7
Electron Configuration[Rn]5f36d17s2
ColorSilver
Discovery
1789 in Germany
Gas phaseN/A
CAS NumberCAS7440-61-1
CID NumberCID23989
Gmelin NumberGmelin16315
NSC NumberN/A
RTECS NumberRTECSYR3490000

Electrical properties
Electrical TypeConductor
Electrical Conductivity3.6×106 S/m
Resistivity2.8×10-7 m Ω
Superconducting Point0.68

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility2.16×10-8
Molar Magnetic Susceptibility5.14×10-9
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 RadiusN/A
Van der Waals Radius186 pm
Crystal StructureBase Centered 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-Life4.471×109 y
Lifetime6.4498×109 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
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.

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