Thermal Properties of Promethium and Sodium
Specific Heat
0.18 J/(kg K)
  
33
1.23 J/(kg K)
  
3
Molar Heat Capacity
Not Available
  
28.23 J/mol·K
  
10
Thermal Conductivity
17.90 W/m·K
  
99+
142.00 W/m·K
  
11
Critical Temperature
Not Available
  
Thermal Expansion
9.00 µm/(m·K)
  
99+
71.00 µm/(m·K)
  
4
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
89.04 kJ/mol
  
99+
Enthalpy of Fusion
7.50 kJ/mol
  
99+
2.59 kJ/mol
  
99+
Enthalpy of Atomization
310.00 kJ/mol
  
34
108.40 kJ/mol
  
99+
Standard Molar Entropy
Not Available
  
51.30 J/mol.K
  
28