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Physical Properties of Promethium and Protactinium

Promethium
Protactinium
Physical Properties of Protactinium and Promethium


Physical Properties
Melting Point
1,042.00 °C   
99+
1,568.00 °C   
21
Boiling Point
3,000.00 °C   
31
4,027.00 °C   
12
Appearance
  
  
Physical State
Solid   
Solid   
Color
Unknown   
Silver   
Luster
Metallic   
Metallic   
Hardness
  
  
Speed of Sound
Not Available   
Not Available   
Optical Properties
  
  
Allotropes
No   
No   
α Allotropes
Not Available   
Not Available   
β Allotropes
Not Available   
Not Available   
γ Allotropes
Not Available   
Not Available   
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