Properties of Protactinium and Rhodium
Melting Point
1,568.00 °C
  
21
1,966.00 °C
  
12
Boiling Point
4,027.00 °C
  
12
3,727.00 °C
  
17
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
1,100.00 MPa
  
9
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
Not Available
  
4,700.00 m/s
  
15
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Pa
  
Rh
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol
  
99+
719.70 kJ/mol
  
29
2nd Energy Level
1,128.00 kJ/mol
  
99+
1,740.00 kJ/mol
  
26
3rd Energy Level
1,814.00 kJ/mol
  
99+
2,997.00 kJ/mol
  
27
Electrochemical Equivalent
1.72 g/amp-hr
  
99+
1.28 g/amp-hr
  
99+
Electron Work Function
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
15.37 g/cm3
  
20
12.41 g/cm3
  
28
Density When Liquid (at m.p.)
Not Available
  
10.70 g/cm3
  
14
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
  
  
Shear Modulus
Not Available
  
Bulk Modulus
Not Available
  
Young's Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
Unknown
  
Symbol
Pa
  
Rh
  
Group Number
Not Available
  
Period Number
7
  
5
  
Atomic Weight
102.91 amu
  
99+
Atomic Volume
15.00 cm3/mol
  
34
8.30 cm3/mol
  
99+
Electron Configuration
[Rn] 5f2 6d1 7s2
  
[Kr] 4d8 5s1
  
Valence Electron Potential
92.00 (-eV)
  
11
64.00 (-eV)
  
22
Atom
  
  
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100
  
FCC-Crystal-Structure-of-Rhodium.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
177.00 nΩ·m
  
21
43.30 nΩ·m
  
99+
Electrical Conductivity
0.05 106/cm Ω
  
34
0.21 106/cm Ω
  
8
Electron Affinity
Not Available
  
109.70 kJ/mol
  
7
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.12 J/(kg K)
  
40
0.24 J/(kg K)
  
22
Thermal Conductivity
47.00 W/m·K
  
32
150.00 W/m·K
  
9
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
Not Available
  
24.98 J/mol·K
  
99+
Thermal Expansion
9.90 µm/(m·K)
  
40
8.20 µm/(m·K)
  
99+
Standard Molar Entropy
198.10 J/mol.K
  
1
31.50 J/mol.K
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
495.40 kJ/mol
  
12
Enthalpy of Fusion
12.34 kJ/mol
  
28
21.76 kJ/mol
  
10
Enthalpy of Atomization
Not Available
  
556.50 kJ/mol
  
12