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Protactinium
Protactinium
☒

Iridium
Iridium
☒



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Protactinium
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Iridium

Physical Properties of Protactinium and Iridium

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

 
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 %
✔✘
-
-
-
 
2,410.00 °C
4,527.00 °C
Solid
Silvery White
Metallic
6.50
1,670.00 MPa
1,760.00 MPa
4,825.00 m/s
2.40
78.00 %
✔✘
-
-
-