Name Francium
Symbol Fr
Atomic Number 87
Atomic Mass 223.0 atomic mass units
Number of Protons 87
Number of Neutrons 136
Number of Electrons 87
Melting Point 27.0 C
Boiling Point 677.0 C
Density Unknown
Normal Phase Solid
Family Alkali Metals
Period 7
Cost Unknown



Origin of Name After the country France
Date and Place of Discovery In 1839 at the Curie Institute in Paris, France
Discovered by Marguerite Catherine Perey
Common Compounds No known compounds.
Interesting facts
  • At one time it was thought to be an aid in diagnosing cancer, but it was proved to be impracticable.
  • It exists as a result of alpha decay in actinium-227.
  • It has 34 known isotopes.
Common Uses
  • There are no commercial applications because it is so unstable and rare.
  • There are no known applications outside of laboratory research.


Photo Courtesy of
Chemical Elements
Jefferson Lab
Web Elements

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