Physical Properties of Francium and Mercury
Melting Point
Not Available
  
Appearance
  
  
Physical State
Solid
  
Liquid
  
Color
NA
  
Silver
  
Luster
NA
  
NA
  
Hardness
  
  
Speed of Sound
Not Available
  
1,451.40 m/s
  
99+
Optical Properties
  
  
Refractive Index
Not Available
  
Reflectivity
Not Available
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available