Physical Properties of Mercury and Protactinium
Melting Point
Not Available
  
1,568.00 °C
  
21
Boiling Point
4,027.00 °C
  
12
Appearance
  
  
Physical State
Liquid
  
Solid
  
Color
Silver
  
Silver
  
Luster
NA
  
Metallic
  
Hardness
  
  
Speed of Sound
1,451.40 m/s
  
99+
Not Available
  
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