Properties of Promethium and Uranium
Melting Point
1,042.00 °C
  
99+
1,132.00 °C
  
39
Boiling Point
3,000.00 °C
  
31
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
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Pm
  
U
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Not Available
  
Sanderson Electronegativity
Not Available
  
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Allen Electronegativity
Not Available
  
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Not Available
  
Ionization Energies
  
  
1st Energy Level
540.00 kJ/mol
  
99+
597.60 kJ/mol
  
99+
2nd Energy Level
1,050.00 kJ/mol
  
99+
1,420.00 kJ/mol
  
99+
3rd Energy Level
2,150.00 kJ/mol
  
99+
1,900.00 kJ/mol
  
99+
Electrochemical Equivalent
1.80 g/amp-hr
  
36
1.48 g/amp-hr
  
99+
Electron Work Function
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
7.26 g/cm3
  
99+
19.10 g/cm3
  
17
Density When Liquid (at m.p.)
Not Available
  
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
  
  
Other Mechanical Properties
NA
  
Symbol
Pm
  
U
  
Group Number
Not Available
  
Period Number
6
  
7
  
Atomic Weight
145.00 amu
  
99+
Atomic Volume
22.39 cm3/mol
  
12
12.59 cm3/mol
  
40
Electron Configuration
[Xe] 4f5 6s2
  
[Rn] 5f3 6d1 7s2
  
Valence Electron Potential
44.10 (-eV)
  
39
170.00 (-eV)
  
4
Atom
  
  
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100
  
ORTH-Crystal-Structure-of-Uranium.jpg#100
  
Radius of an Atom
  
  
Lattice Constant
Not Available
  
Lattice Angles
Unknown
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Electrical Conductivity
Not Available
  
0.04 10
6/cm Ω
  
37
Electron Affinity
50.00 kJ/mol
  
21
Not Available
  
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.18 J/(kg K)
  
33
0.12 J/(kg K)
  
40
Thermal Conductivity
17.90 W/m·K
  
99+
27.50 W/m·K
  
40
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
Not Available
  
27.67 J/mol·K
  
15
Thermal Expansion
9.00 µm/(m·K)
  
99+
13.90 µm/(m·K)
  
27
Standard Molar Entropy
Not Available
  
50.20 J/mol.K
  
31
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
477.00 kJ/mol
  
13
Enthalpy of Fusion
7.50 kJ/mol
  
99+
15.48 kJ/mol
  
19
Enthalpy of Atomization
310.00 kJ/mol
  
34
489.50 kJ/mol
  
14