Thermal Properties of Promethium and Thallium
Specific Heat
0.18 J/(kg K)
  
33
0.13 J/(kg K)
  
39
Molar Heat Capacity
Not Available
  
26.32 J/mol·K
  
29
Thermal Conductivity
17.90 W/m·K
  
99+
46.10 W/m·K
  
33
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
9.00 µm/(m·K)
  
99+
29.90 µm/(m·K)
  
12
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
162.10 kJ/mol
  
99+
Enthalpy of Fusion
7.50 kJ/mol
  
99+
4.27 kJ/mol
  
99+
Enthalpy of Atomization
310.00 kJ/mol
  
34
179.90 kJ/mol
  
99+
Standard Molar Entropy
Not Available
  
64.20 J/mol.K
  
19