Properties of Polonium and Uranium
Melting Point
1,132.00 °C
  
39
Boiling Point
3,818.00 °C
  
16
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
2,350.00 MPa
  
2
Vickers Hardness
Not Available
  
1,960.00 MPa
  
2
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Not Available
  
Speed of Sound
Not Available
  
3,155.00 m/s
  
25
Allotropes
Yes
  
No
  
α Allotropes
Not Available
  
β Allotropes
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Po
  
U
  
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
812.10 kJ/mol
  
14
597.60 kJ/mol
  
99+
2nd Energy Level
Not Available
  
1,420.00 kJ/mol
  
99+
3rd Energy Level
Not Available
  
1,900.00 kJ/mol
  
99+
Electrochemical Equivalent
3.90 g/amp-hr
  
8
1.48 g/amp-hr
  
99+
Electron Work Function
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
9.20 g/cm3
  
99+
19.10 g/cm3
  
17
Density When Liquid (at m.p.)
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Bulk Modulus
Not Available
  
Young's Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
NA
  
Symbol
Po
  
U
  
Period Number
6
  
7
  
Atomic Volume
22.23 cm3/mol
  
13
12.59 cm3/mol
  
40
Electron Configuration
[Xe] 4f14 5d10 6s2 6p4
  
[Rn] 5f3 6d1 7s2
  
Valence Electron Potential
Not Available
  
170.00 (-eV)
  
4
Atom
  
  
Crystal Lattice
MON-Crystal-Structure-of-Polonium.jpg#100
  
ORTH-Crystal-Structure-of-Uranium.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
  
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.04 106/cm Ω
  
37
Electron Affinity
183.30 kJ/mol
  
3
Not Available
  
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.12 J/(kg K)
  
40
0.12 J/(kg K)
  
40
Thermal Conductivity
20.00 W/m·K
  
99+
27.50 W/m·K
  
40
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
26.40 J/mol·K
  
28
27.67 J/mol·K
  
15
Thermal Expansion
23.50 µm/(m·K)
  
16
13.90 µm/(m·K)
  
27
Standard Molar Entropy
Not Available
  
50.20 J/mol.K
  
31
Enthalpy
  
  
Enthalpy of Vaporization
60.30 kJ/mol
  
99+
477.00 kJ/mol
  
13
Enthalpy of Fusion
13.00 kJ/mol
  
26
15.48 kJ/mol
  
19
Enthalpy of Atomization
134.00 kJ/mol
  
99+
489.50 kJ/mol
  
14