Properties of Uranium and Gold
Melting Point
1,132.00 °C
  
39
1,064.43 °C
  
99+
Boiling Point
3,818.00 °C
  
16
2,807.00 °C
  
36
Hardness
  
  
Brinell Hardness
2,350.00 MPa
  
2
194.00 MPa
  
99+
Vickers Hardness
1,960.00 MPa
  
2
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
3,155.00 m/s
  
25
2,030.00 m/s
  
99+
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
U
  
Au
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
597.60 kJ/mol
  
99+
890.10 kJ/mol
  
8
2nd Energy Level
1,420.00 kJ/mol
  
99+
1,980.00 kJ/mol
  
12
3rd Energy Level
1,900.00 kJ/mol
  
99+
Not Available
  
Electrochemical Equivalent
1.48 g/amp-hr
  
99+
2.45 g/amp-hr
  
21
Other Chemical Properties
Density
  
  
Density At Room Temperature
19.10 g/cm3
  
17
19.30 g/cm3
  
15
Density When Liquid (at m.p.)
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Symbol
U
  
Au
  
Period Number
7
  
6
  
Atomic Volume
12.59 cm3/mol
  
40
10.20 cm3/mol
  
99+
Electron Configuration
[Rn] 5f3 6d1 7s2
  
[Xe] 4f14 5d10 6s1
  
Valence Electron Potential
170.00 (-eV)
  
4
43.40 (-eV)
  
99+
Atom
  
  
Crystal Lattice
ORTH-Crystal-Structure-of-Uranium.jpg#100
  
FCC-Crystal-Structure-of-Gold.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Electrical Conductivity
0.04 106/cm Ω
  
37
0.45 106/cm Ω
  
3
Electron Affinity
Not Available
  
222.80 kJ/mol
  
1
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.12 J/(kg K)
  
40
0.13 J/(kg K)
  
39
Thermal Conductivity
27.50 W/m·K
  
40
318.00 W/m·K
  
3
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
27.67 J/mol·K
  
15
25.42 J/mol·K
  
40
Thermal Expansion
13.90 µm/(m·K)
  
27
14.20 µm/(m·K)
  
26
Standard Molar Entropy
50.20 J/mol.K
  
31
47.40 J/mol.K
  
32
Enthalpy
  
  
Enthalpy of Vaporization
477.00 kJ/mol
  
13
324.40 kJ/mol
  
27
Enthalpy of Fusion
15.48 kJ/mol
  
19
12.55 kJ/mol
  
27
Enthalpy of Atomization
489.50 kJ/mol
  
14
364.00 kJ/mol
  
25