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Physical Properties of Niobium and Promethium

Niobium
Promethium
Physical Properties of Promethium and Niobium


Physical Properties
Melting Point
2,468.00 °C   
6
1,042.00 °C   
99+
Boiling Point
2,468.00 °C   
99+
3,000.00 °C   
31
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Unknown   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
6.00   
6
Not Available   
Brinell Hardness
735.00 MPa   
14
Not Available   
Vickers Hardness
870.00 MPa   
12
Not Available   
Speed of Sound
3,480.00 m/s   
21
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   
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