Stable isotope Uranium (U)

Isotope Atomic Mass Half-life Mode of Decay Nuclear Spin Nuclear Magnetic Moment
U-230 230.03393 20.80 days α to Th-226 0 No data available
U-231 231.03626 4.20 days α to Th-227 5/2 No data available
U-232 232.03715 68.90 years α to Th-228 0 No data available
U-233 233.039628 1.59 x 105 years α to Th-229; SF 5/2 0.59
U-234 234.0409468 2.45 x 105 years α to Th-230; SF 0 No data available
U-235 235.0439242 7.04 x 108 years α to Th-231; SF 7/2 0.38
U-236 236.045561 2.34 x 107 years α to Th-232; SF 0 No data available
U-237 237.048723 6.75 days β- to Np-237 1/2 No data available
U-238 238.0507847 4.46 x 109 years α to Th-234; SF 0 No data available

Properties of Uranium

Name Uranium
Symbol U
Atomic number 92
Atomic weight 238.02891
Standard state Solid at 298 ºK
CAS Registry ID 7440-61-1
Group in periodic table N/A
Group name Actinoid
Period in periodic table 7 (Actinoid)
Block in periodic table f-block
Color Metallic gray
Classification Metallic
Melting point 1132.2 °C
Boiling point 3900 °C
Vaporization point 4131 °C
Thermal conductivity 27.6  W/(m·K)
Electrical resistivity 28 x 10-8 Ω·m
Electronegativity 1.38
Heat of vaporization 420 kJ·mol-1
Heat of fusion 14 kJ·mol-1
Density of liquid 17.3 g/cm3 at 1132.2 °C
Density of solid 19.05 g/cm3
Electron configuration [Rn]5f36d17s2
Ionic radii U3+: 1.03 Å, U4+: 0.89 Å, U5+: 0.76 Å (coordination number 6); U6+: 0.45 Å (coordination number 2); U6+: 0.81 Å (coordination number 7)
Oxidation states +2, +3, +4, +4, +5, +6