Properties of Promethium and Copper
Melting Point
1,042.00 °C
  
99+
1,084.62 °C
  
40
Boiling Point
3,000.00 °C
  
31
2,562.00 °C
  
99+
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
Not Available
  
3,810.00 m/s
  
19
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Pm
  
Cu
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Not Available
  
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Not Available
  
Ionization Energies
  
  
1st Energy Level
540.00 kJ/mol
  
99+
745.50 kJ/mol
  
22
2nd Energy Level
1,050.00 kJ/mol
  
99+
1,957.90 kJ/mol
  
15
3rd Energy Level
2,150.00 kJ/mol
  
99+
3,555.00 kJ/mol
  
15
Electrochemical Equivalent
1.80 g/amp-hr
  
36
1.19 g/amp-hr
  
99+
Electron Work Function
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
7.26 g/cm3
  
99+
8.96 g/cm3
  
99+
Density When Liquid (at m.p.)
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Not Available
  
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
NA
  
Symbol
Pm
  
Cu
  
Group Number
Not Available
  
Period Number
6
  
4
  
Atomic Weight
145.00 amu
  
99+
Atomic Volume
22.39 cm3/mol
  
12
7.10 cm3/mol
  
99+
Electron Configuration
[Xe] 4f5 6s2
  
[Ar] 3d10 4s1
  
Valence Electron Potential
44.10 (-eV)
  
39
34.00 (-eV)
  
99+
Atom
  
  
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100
  
FCC-Crystal-Structure-of-Copper.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
  
  
Resistivity
16.78 nΩ·m
  
99+
Electrical Conductivity
Not Available
  
0.60 10
6/cm Ω
  
2
Electron Affinity
50.00 kJ/mol
  
21
222.80 kJ/mol
  
1
Magnetic Characteristics
  
  
Permeability
Not Available
  
1.256629 * 10
-6 H/m
  
5
Susceptibility
Not Available
  
-9.63 * 10
-6
  
4
Specific Heat
0.18 J/(kg K)
  
33
0.38 J/(kg K)
  
15
Thermal Conductivity
17.90 W/m·K
  
99+
401.00 W/m·K
  
2
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
Not Available
  
24.44 J/mol·K
  
99+
Thermal Expansion
9.00 µm/(m·K)
  
99+
16.50 µm/(m·K)
  
25
Standard Molar Entropy
Not Available
  
33.20 J/mol.K
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
283.70 kJ/mol
  
33
Enthalpy of Fusion
7.50 kJ/mol
  
99+
7.11 kJ/mol
  
99+
Enthalpy of Atomization
310.00 kJ/mol
  
34
338.90 kJ/mol
  
29