Physical Properties of Nihonium and Protactinium
Melting Point
1,568.00 °C
  
21
Boiling Point
1,130.00 °C
  
99+
4,027.00 °C
  
12
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Unknown
  
Silver
  
Luster
Unknown Luster
  
Metallic
  
Hardness
  
  
Speed of Sound
Not Available
  
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