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Cesium
Cesium
☒

Protactinium
Protactinium
☒



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Cesium
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Protactinium

Physical Properties of Cesium and Protactinium

Physical

Melting Point

Boiling Point

Physical State

Color

Luster

Mohs Hardness

Brinell Hardness

Vickers Hardness

Speed of Sound

Refractive Index

Reflectivity

Allotropes

α Allotropes

β Allotropes

γ Allotropes

 
28.50 °C
678.40 °C
Solid
Silvery Gold
-
0.20
0.14 MPa
0.14 MPa
1,630.00 m/s
1.93
35.00 %
✔✘
-
-
-
 
1,568.00 °C
4,027.00 °C
Solid
Silver
Metallic
5.00
125.00 MPa
220.00 MPa
12,400.00 m/s
1.60
60.00 %
✔✘
-
-
-