Properties of Rhodium and Palladium
Melting Point
1,966.00 °C
  
12
1,554.90 °C
  
22
Boiling Point
3,727.00 °C
  
17
2,963.00 °C
  
33
Hardness
  
  
Vickers Hardness
1,100.00 MPa
  
9
Optical Properties
  
  
Refractive Index
Not Available
  
Speed of Sound
4,700.00 m/s
  
15
3,070.00 m/s
  
26
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Rh
  
Pd
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol
  
29
520.23 kJ/mol
  
99+
2nd Energy Level
1,740.00 kJ/mol
  
26
7,298.22 kJ/mol
  
2
3rd Energy Level
2,997.00 kJ/mol
  
27
11,815.13 kJ/mol
  
3
Electrochemical Equivalent
1.28 g/amp-hr
  
99+
1.99 g/amp-hr
  
30
Other Chemical Properties
Density
  
  
Density At Room Temperature
12.41 g/cm3
  
28
12.02 g/cm3
  
29
Density When Liquid (at m.p.)
10.70 g/cm3
  
14
10.38 g/cm3
  
17
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Symbol
Rh
  
Pd
  
Period Number
5
  
5
  
Atomic Weight
102.91 amu
  
99+
106.42 amu
  
99+
Atomic Volume
8.30 cm3/mol
  
99+
8.90 cm3/mol
  
99+
Electron Configuration
[Kr] 4d8 5s1
  
[Kr] 4d10
  
Valence Electron Potential
64.00 (-eV)
  
22
33.00 (-eV)
  
99+
Atom
  
  
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100
  
FCC-Crystal-Structure-of-Palladium.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
  
  
Resistivity
43.30 nΩ·m
  
99+
105.40 nΩ·m
  
29
Electrical Conductivity
0.21 106/cm Ω
  
8
0.10 106/cm Ω
  
22
Electron Affinity
109.70 kJ/mol
  
7
54.23 kJ/mol
  
17
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.24 J/(kg K)
  
22
0.24 J/(kg K)
  
23
Thermal Conductivity
150.00 W/m·K
  
9
71.80 W/m·K
  
23
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
24.98 J/mol·K
  
99+
25.98 J/mol·K
  
33
Thermal Expansion
8.20 µm/(m·K)
  
99+
11.80 µm/(m·K)
  
33
Standard Molar Entropy
31.50 J/mol.K
  
99+
37.60 J/mol.K
  
40
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol
  
12
376.60 kJ/mol
  
19
Enthalpy of Fusion
21.76 kJ/mol
  
10
16.74 kJ/mol
  
18
Enthalpy of Atomization
556.50 kJ/mol
  
12
393.30 kJ/mol
  
22