Physical Properties of Actinium and Technetium
Melting Point
1,227.00 °C
  
38
Boiling Point
3,200.00 °C
  
26
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery White
  
Shiny Gray
  
Luster
NA
  
NA
  
Hardness
  
  
Speed of Sound
Not Available
  
16,200.00 m/s
  
1
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available