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Physical Properties of Rubidium and Niobium

Rubidium
Niobium
Physical Properties of Niobium and Rubidium


Physical Properties
Melting Point
38.89 °C   
99+
2,468.00 °C   
6
Boiling Point
688.00 °C   
99+
2,468.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Grayish White   
Gray   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
0.30   
24
6.00   
6
Brinell Hardness
0.22 MPa   
99+
735.00 MPa   
14
Vickers Hardness
Not Available   
870.00 MPa   
12
Speed of Sound
1,300.00 m/s   
99+
3,480.00 m/s   
21
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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