|appearance=silvery gray metallic; corrodes to a [[spalling]] black oxide coat in air
|appearance=silvery gray metallic; corrodes to a [[spalling]] black oxide coat in air
|image name=HEUraniumC.jpg
|image name=HEUraniumC.jpg
|image alt=Two hands in brown gloves holding a blotched gray disk with a number 2068 hand-written on it
|image size=
|image name comment=
|image name 2=
|image name 2 comment=
|atomic mass=238.02891
|atomic mass ref=<ref name="IUPAC">[http://www.ciaaw.org/atomic-weights.htm Standard Atomic Weights 2013]. [[Commission on Isotopic Abundances and Atomic Weights]]</ref>
|oxidation states='''6''', 5, 4, 3,<ref>{{cite book|title=The Chemistry of the Actinide and Transactinide Elements|edition=3rd|editor1=Morss, L.R. |editor2=Edelstein, N.M. |editor3=Fuger, J. |place=Netherlands|publisher=Springer|year=2006|isbn=9048131464}}</ref> 2, 1
|lattice constants=''a'' = 285.35 pm<br />''b'' = 586.97 pm<br />''c'' = 495.52 pm (at 20 °C)<ref name="Arblaster 2018">{{cite book |last=Arblaster |first= John W. |title=Selected Values of the Crystallographic Properties of Elements |publisher=ASM International |publication-place=Materials Park, Ohio |date=2018 |isbn=978-1-62708-155-9}}</ref>
|oxidation states comment=(a weakly [[base (chemistry)|basic]] oxide)
|electronegativity=1.38
|electronegativity=1.38
|number of ionization energies=2
|number of ionization energies=2
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|thermal conductivity 2=
|thermal conductivity 2=
|thermal diffusivity=
|thermal diffusivity=
|thermal expansion=
|thermal expansion=<!-- see thermal expansion comment -->
|thermal expansion comment={{val|15.46|e=−6}}/K (at 20 °C){{efn|text=The thermal expansion is [[Anisotropy|anisotropic]]: the coefficients for each crystal axis (at 20 °C) are α<sub>''a''</sub> = {{val|25.27|e=−6}}/K, α<sub>''b''</sub> = {{val|0.76|e=−6}}/K, α<sub>''c''</sub> = {{val|20.35|e=−6}}/K, and α<sub>average</sub> = α<sub>volume</sub>/3 = {{val|15.46|e=−6}}/K.}}
^The thermal expansion is anisotropic: the coefficients for each crystal axis (at 20 °C) are αa = 25.27×10−6/K, αb = 0.76×10−6/K, αc = 20.35×10−6/K, and αaverage = αvolume/3 = 15.46×10−6/K.
References
These references will appear in the article, but this list appears only on this page.
^ abArblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN978-1-62708-155-9.
^Morss, L.R.; Edelstein, N.M.; Fuger, J., eds. (2006). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Netherlands: Springer. ISBN978-9048131464.
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ref=|atomic radius calculated comment=|covalent radius=|covalent radius ref=|covalent radius comment=|Van der Waals radius=|Van der Waals radius ref=|Van der Waals radius comment=<!-- Miscellanea -->|crystal structure=|crystal structure prefix=|crystal structure ref=|crystal structure comment=|lattice constant=|crystal structure 2=|crystal structure 2 prefix=|crystal structure 2 ref=|crystal structure 2 comment=|lattice constant 2=|speed of sound=|speed of sound ref=|speed of sound comment=|speed of sound rod at 20=|speed of sound rod at 20 ref=|speed of sound rod at 20 comment=|speed of sound rod at r.t.=|speed of sound rod at r.t. ref=|speed of sound rod at r.t. comment=|thermal expansion=|thermal expansion ref=|thermal expansion comment=|thermal expansion at 25=|thermal expansion at 25 ref=|thermal expansion at 25 comment=|thermal conductivity=|thermal conductivity ref=|thermal conductivity comment=|thermal conductivity 2=|thermal conductivity 2 ref=|thermal conductivity 2 comment=|thermal diffusivity=|thermal diffusivity ref=|thermal diffusivity comment=|electrical resistivity=|electrical resistivity unit prefix=|electrical resistivity ref=|electrical resistivity comment=|electrical resistivity at 0=|electrical resistivity at 0 ref=|electrical resistivity at 0 comment=|electrical resistivity at 20=|electrical resistivity at 20 ref=|electrical resistivity at 20 comment=|band gap=|band gap ref=|band gap comment=|Curie point K=|Curie point ref=|Curie point comment=|magnetic ordering=|magnetic ordering ref=|magnetic ordering comment=|tensile strength=|tensile strength ref=|tensile strength comment=|Young's modulus=|Young's modulus ref=|Young's modulus comment=|Shear modulus=|Shear modulus ref=|Shear modulus comment=|Bulk modulus=|Bulk modulus ref=|Bulk modulus comment=|Poisson ratio=|Poisson ratio ref=|Poisson ratio comment=|Mohs hardness=|Mohs hardness ref=|Mohs hardness comment=|Mohs hardness 2=|Mohs hardness 2 ref=|Mohs hardness 2 comment=|Vickers hardness=|Vickers hardness ref=|Vickers hardness comment=|Brinell hardness=|Brinell hardness ref=|Brinell hardness comment=|CAS number=|CAS number ref=|CAS number comment=<!-- History -->|naming=|predicted by=|prediction date ref=|prediction date=|discovered by=|discovery date ref=|discovery date=|first isolation by=|first isolation date ref=|first isolation date=|discovery and first isolation by=|named by=|named date ref=|named date=|history comment label=|history comment=<!-- Isotopes not here --><!-- other -->|engvar=|QID=}}
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Theoretical element
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