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Physical Properties of Hafnium and Thallium

Hafnium
Thallium
Physical Properties of Thallium and Hafnium


Physical Properties
Melting Point
2,150.00 °C   
10
303.50 °C   
99+
Boiling Point
5,400.00 °C   
5
1,457.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Silvery White   
Luster
Metallic   
NA   
Hardness
  
  
Mohs Hardness
5.50   
7
1.20   
20
Brinell Hardness
1,450.00 MPa   
6
26.50 MPa   
99+
Vickers Hardness
1,520.00 MPa   
5
Not Available   
Speed of Sound
3,010.00 m/s   
27
818.00 m/s   
99+
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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