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Francium
Francium




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Physical Properties of Francium

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Physical

Melting Point

27.00 °C
Rank: 81 (Overall)
-38.83 3410
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Boiling Point

677.00 °C
Rank: 78 (Overall)
0 5660
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Appearance

Physical State

Solid

Color

-

Luster

-

Hardness

Mohs Hardness

0.20
Rank: 27 (Overall)
0.2 8.5
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Brinell Hardness

119.00 MPa
Rank: 59 (Overall)
0.14 3490
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Vickers Hardness

300.00 MPa
Rank: 46 (Overall)
0 3920
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Speed of Sound

2,440.00 m/s
Rank: 54 (Overall)
818 16200
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Optical Properties

Refractive Index

1.70
Rank: 27 (Overall)
0.155 3.41
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Reflectivity

72.00 %
Rank: 11 (Overall)
5 97
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Allotropes

8% - Alkali Metals Metals

α Allotropes

-

β Allotropes

-

γ Allotropes

-