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Physical Properties of Francium and Promethium

Francium
Promethium
Physical Properties of Promethium and Francium


Physical Properties
Melting Point
27.00 °C   
99+
1,042.00 °C   
99+
Boiling Point
677.00 °C   
99+
3,000.00 °C   
31
Appearance
  
  
Physical State
Solid   
Solid   
Color
NA   
Unknown   
Luster
NA   
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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