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Physical Properties of Protactinium and Lanthanum

Protactinium
Lanthanum
Physical Properties of Lanthanum and Protactinium


Physical Properties
Melting Point
1,568.00 °C   
21
920.00 °C   
99+
Boiling Point
4,027.00 °C   
12
3,469.00 °C   
18
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery White   
Luster
Metallic   
NA   
Hardness
  
  
Mohs Hardness
Not Available   
2.50   
14
Brinell Hardness
Not Available   
350.00 MPa   
30
Vickers Hardness
Not Available   
360.00 MPa   
26
Speed of Sound
Not Available   
2,475.00 m/s   
37
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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