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Gadolinium
Gadolinium

Promethium
Promethium



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Gadolinium
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Promethium

Physical Properties of Gadolinium and Promethium

Physical

Melting Point

1,311.00 °C1,042.00 °C
-38.83 3410
👆🏻

Boiling Point

3,233.00 °C3,000.00 °C
0 5660
👆🏻

Appearance

Physical State

Solid
Solid

Color

Silvery White
-

Luster

Metallic
Metallic

Hardness

Mohs Hardness

4.50-
0.2 8.5
👆🏻

Brinell Hardness

700.00 MPa400.00 MPa
0.14 3490
👆🏻

Vickers Hardness

510.00 MPa600.00 MPa
0 3920
👆🏻

Speed of Sound

2,680.00 m/s2,260.00 m/s
818 16200
👆🏻

Optical Properties

Refractive Index

1.971.70
0.155 3.41
👆🏻

Reflectivity

59.00 %63.00 %
5 97
👆🏻

Allotropes

α Allotropes

-
-

β Allotropes

-
-

γ Allotropes

-
-