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Physical Properties of Potassium and Sodium

Potassium
Sodium
Physical Properties of Sodium and Potassium


Physical Properties
Melting Point
63.65 °C   
99+
97.72 °C   
99+
Boiling Point
774.00 °C   
99+
883.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery Gray   
Silvery White   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
0.40   
23
0.50   
22
Brinell Hardness
0.36 MPa   
99+
0.69 MPa   
99+
Speed of Sound
2,000.00 m/s   
99+
3,200.00 m/s   
24
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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