Physical Properties of Rubidium and Sodium
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Grayish White
  
Silvery White
  
Luster
NA
  
Metallic
  
Hardness
  
  
Speed of Sound
1,300.00 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