Properties of Promethium and Gold
Melting Point
1,042.00 °C
  
99+
1,064.43 °C
  
99+
Boiling Point
3,000.00 °C
  
31
2,807.00 °C
  
36
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
194.00 MPa
  
99+
Vickers Hardness
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
Not Available
  
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
Pm
  
Au
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Not Available
  
Sanderson Electronegativity
Not Available
  
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+
890.10 kJ/mol
  
8
2nd Energy Level
1,050.00 kJ/mol
  
99+
1,980.00 kJ/mol
  
12
3rd Energy Level
2,150.00 kJ/mol
  
99+
Not Available
  
Electrochemical Equivalent
1.80 g/amp-hr
  
36
2.45 g/amp-hr
  
21
Electron Work Function
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
7.26 g/cm3
  
99+
19.30 g/cm3
  
15
Density When Liquid (at m.p.)
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
NA
  
Symbol
Pm
  
Au
  
Group Number
Not Available
  
Period Number
6
  
6
  
Atomic Weight
145.00 amu
  
99+
Atomic Volume
22.39 cm3/mol
  
12
10.20 cm3/mol
  
99+
Electron Configuration
[Xe] 4f5 6s2
  
[Xe] 4f14 5d10 6s1
  
Valence Electron Potential
44.10 (-eV)
  
39
43.40 (-eV)
  
99+
Atom
  
  
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100
  
FCC-Crystal-Structure-of-Gold.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
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Electrical Conductivity
Not Available
  
0.45 10
6/cm Ω
  
3
Electron Affinity
50.00 kJ/mol
  
21
222.80 kJ/mol
  
1
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.18 J/(kg K)
  
33
0.13 J/(kg K)
  
39
Thermal Conductivity
17.90 W/m·K
  
99+
318.00 W/m·K
  
3
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
Not Available
  
25.42 J/mol·K
  
40
Thermal Expansion
9.00 µm/(m·K)
  
99+
14.20 µm/(m·K)
  
26
Standard Molar Entropy
Not Available
  
47.40 J/mol.K
  
32
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
324.40 kJ/mol
  
27
Enthalpy of Fusion
7.50 kJ/mol
  
99+
12.55 kJ/mol
  
27
Enthalpy of Atomization
310.00 kJ/mol
  
34
364.00 kJ/mol
  
25