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Physical Properties of Polonium and Hafnium

Polonium
Hafnium
Physical Properties of Hafnium and Polonium


Physical Properties
Melting Point
254.00 °C   
99+
2,150.00 °C   
10
Boiling Point
962.00 °C   
99+
5,400.00 °C   
5
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Gray   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
5.50   
7
Brinell Hardness
Not Available   
1,450.00 MPa   
6
Vickers Hardness
Not Available   
1,520.00 MPa   
5
Speed of Sound
Not Available   
3,010.00 m/s   
27
Optical Properties
  
  
Allotropes
Yes   
No   
α Allotropes
α-polonium   
Not Available   
β Allotropes
β-polonium   
Not Available   
γ Allotropes
Not Available   
Not Available   
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