![[ATOM]](atom.gif) |
Francium
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Information valid for Fr-223 unless otherwise noted
Basic Information
Symbol: Fr
Atomic Number: 87
Mass: (223.0)
Melting Point: 27.0 C
Boiling Point: 677.0 C
Number of Protons/Electrons: 87
Number of Neutrons: 136
Classification: Alkali Metal
Crystal Structure: Cubic
Density @ 293 K: Unknown
Color: Unknown
Atomic Structure
![[Bohr Model of Francium]](b0087.gif) |
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Number of Energy Levels: 7
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 32
Fifth Energy Level: 18
Sixth Energy Level: 8
Seventh Energy Level: 1
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Isotopes
| Isotope |
Half Life |
| Fr-212 |
20.0 minutes |
| Fr-221 |
4.8 minutes |
| Fr-222 |
14.3 minutes |
| Fr-223 |
21.8 minutes |
Facts
Date of Discovery: 1939
Discoverer: Marguerite Derey
Name Origin: After France
Uses: No uses known
Obtained From: decay of actinium