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Physical Properties of Thallium and Cobalt

Thallium
Cobalt
Physical Properties of Cobalt and Thallium


Physical Properties
Melting Point
303.50 °C   
99+
1,495.00 °C   
29
Boiling Point
1,457.00 °C   
99+
2,870.00 °C   
34
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Gray   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
1.20   
20
5.00   
8
Brinell Hardness
26.50 MPa   
99+
470.00 MPa   
26
Vickers Hardness
Not Available   
1,043.00 MPa   
11
Speed of Sound
818.00 m/s   
99+
4,720.00 m/s   
14
Optical Properties
  
  
Reflectivity
Not Available   
67.00 %   
11
Allotropes
No   
Yes   
α Allotropes
Not Available   
α-Cobalt   
β Allotropes
Not Available   
β-Cobalt   
γ Allotropes
Not Available   
Not Available   
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