Properties of Rhodium and Promethium
Melting Point
1,966.00 °C
  
12
1,042.00 °C
  
99+
Boiling Point
3,727.00 °C
  
17
3,000.00 °C
  
31
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
1,100.00 MPa
  
9
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
4,700.00 m/s
  
15
Not Available
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Rh
  
Pm
  
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
  
Electropositivity
  
  
Pauling Electropositivity
Not Available
  
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol
  
29
540.00 kJ/mol
  
99+
2nd Energy Level
1,740.00 kJ/mol
  
26
1,050.00 kJ/mol
  
99+
3rd Energy Level
2,997.00 kJ/mol
  
27
2,150.00 kJ/mol
  
99+
Electrochemical Equivalent
1.28 g/amp-hr
  
99+
1.80 g/amp-hr
  
36
Electron Work Function
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
12.41 g/cm3
  
28
7.26 g/cm3
  
99+
Density When Liquid (at m.p.)
10.70 g/cm3
  
14
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
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
Rh
  
Pm
  
Group Number
Not Available
  
Period Number
5
  
6
  
Atomic Weight
102.91 amu
  
99+
145.00 amu
  
99+
Atomic Volume
8.30 cm3/mol
  
99+
22.39 cm3/mol
  
12
Electron Configuration
[Kr] 4d8 5s1
  
[Xe] 4f5 6s2
  
Valence Electron Potential
64.00 (-eV)
  
22
44.10 (-eV)
  
39
Atom
  
  
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100
  
DHCP-Crystal-Structure-of-Promethium.jpg#100
  
Radius of an Atom
  
  
Lattice Constant
Not Available
  
Lattice Angles
π/2, π/2, π/2
  
Unknown
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
43.30 nΩ·m
  
99+
Electrical Conductivity
0.21 10
6/cm Ω
  
8
Not Available
  
Electron Affinity
109.70 kJ/mol
  
7
50.00 kJ/mol
  
21
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.24 J/(kg K)
  
22
0.18 J/(kg K)
  
33
Thermal Conductivity
150.00 W/m·K
  
9
17.90 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
24.98 J/mol·K
  
99+
Not Available
  
Thermal Expansion
8.20 µm/(m·K)
  
99+
9.00 µm/(m·K)
  
99+
Standard Molar Entropy
31.50 J/mol.K
  
99+
Not Available
  
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol
  
12
Not Available
  
Enthalpy of Fusion
21.76 kJ/mol
  
10
7.50 kJ/mol
  
99+
Enthalpy of Atomization
556.50 kJ/mol
  
12
310.00 kJ/mol
  
34