Physical Properties of Rhenium and Chromium
Melting Point
1,857.00 °C
  
14
Boiling Point
2,672.00 °C
  
39
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery Gray
  
Silver
  
Luster
Metallic
  
Metallic
  
Hardness
  
  
Brinell Hardness
1,320.00 MPa
  
8
Vickers Hardness
1,350.00 MPa
  
7
1,060.00 MPa
  
10
Speed of Sound
4,700.00 m/s
  
15
5,940.00 m/s
  
5
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available