Relative atomic mass: [223]

English: Francium
French: Francium
Croatian: Francij
German: Francium
Italian: Francio
Spanish: Francio

Atomic number: 87
Group numbers: 1
Period: 7
Standard state (20 oC): solid

Discovery: 1939 Marguerite Perey (FR)
Francium was discovered by Marguerite Perey (FR) in 1939. Named for France, the nation of its discovery. It is a highly rare and unstable, radioactive metal. Its chemical properties are similar to caesium. Francium is formed from the decay of actinium. It can be produced by bombarding radium or astatine with neutrons. Since its isotopes have such short half-lives there are no commercially significant compounds of francium.
Electronic configuration: [Rn] 7s1
Formal oxidation number: +1
Atomic radius: 282 pm

Electronegativities: 0.7
Thermal conductivity: 15 W/(m K)
Electrical resistivity (20 oC): - microOhm cm

Melting point: 27 oC
Boiling point: 677 oC

Heat of fusion: - kJ/mol
Heat of vaporization: - kJ/mol
Heat of atomization: 75 kJ/mol

86Rn <= 87Fr => 88Ra

ASCII Periodic Table of the Elements
6 Jan. 2020
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