Physical Properties of Darmstadtium and Promethium
Melting Point
Not Available
  
1,042.00 °C
  
99+
Boiling Point
Not Available
  
3,000.00 °C
  
31
Appearance
  
  
Physical State
Solid
  
Solid
  
Luster
Unknown Luster
  
Metallic
  
Hardness
  
  
Speed of Sound
5,090.00 m/s
  
9
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