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Promethium
Promethium
☒

Nihonium
Nihonium
☒



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Promethium
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Nihonium

Physical Properties of Promethium and Nihonium

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

 
1,042.00 °C
3,000.00 °C
Solid
-
Metallic
-
400.00 MPa
600.00 MPa
2,260.00 m/s
1.70
63.00 %
✔✘
-
-
-
 
430.00 °C
1,130.00 °C
Solid
-
Unknown Luster
-
600.00 MPa
350.00 MPa
3,600.00 m/s
1.30
60.00 %
✔✘
-
-
-