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Physical Properties of Potassium and Rubidium

Potassium
Rubidium
Physical Properties of Rubidium and Potassium


Physical Properties
Melting Point
63.65 °C   
99+
38.89 °C   
99+
Boiling Point
774.00 °C   
99+
688.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery Gray   
Grayish White   
Luster
NA   
NA   
Hardness
  
  
Mohs Hardness
0.40   
23
0.30   
24
Brinell Hardness
0.36 MPa   
99+
0.22 MPa   
99+
Speed of Sound
2,000.00 m/s   
99+
1,300.00 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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