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Francium
NOK0.00
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Fr-87
Francium
Alkali metals
Â
Atomic mass:223Â u
Melting point:27°C (300.15 K)
Boiling point:676.85°C (950 K)
Discovery date:1939
Discovered by:Marguerite Perey
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Â
Francium
Alkali metals
Â
3D Bohr model from Signal Garden
Francium is a chemical element with the symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223, has a half-life of only 22 minutes. It is the second-most electropositive element, behind only caesium, and is the second rarest naturally occurring element.
WikipediaAtomic mass:223Â u
Melting point:27°C (300.15 K)
Boiling point:676.85°C (950 K)
Discovery date:1939
Discovered by:Marguerite Perey
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