Thermal Properties of Promethium and Radium
Specific Heat
0.18 J/(kg K)
  
33
0.12 J/(kg K)
  
40
Molar Heat Capacity
Not Available
  
Not Available
  
Thermal Conductivity
17.90 W/m·K
  
99+
18.60 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
9.00 µm/(m·K)
  
99+
Not Available
  
Enthalpy
  
  
Enthalpy of Fusion
7.50 kJ/mol
  
99+
Not Available
  
Enthalpy of Atomization
310.00 kJ/mol
  
34
163.00 kJ/mol
  
99+
Standard Molar Entropy
Not Available
  
71.00 J/mol.K
  
14