Periodic table of the elements
RadonFranciumRadium
87
Fr
Francium
(223)
2
8
18
32
18
8
1
87
Fr
Francium
(223)
2
8
18
32
18
8
1
General
NameFrancium
SymbolFr
Number87
Chemical seriesAlkali metals
Group / Period1 / 7
Blocks-block
CAS registry number7440-73-5

Francium is a radioactive element

Physical properties
Statesolid
Density1.87 g/cm3
Melting point300 K (27 °C, 80 °F)
Boiling point950 K (677 °C, 1250 °F)
Critical point

Atomic properties
Atomic Weight(223) g/mol
Crystal structurecubic body centered
Electronegativity0.7
Atomic radius
Atomic radius (calculated)
Electron configuration[Rn] 7s1
Electrons per shell2, 8, 18, 32, 18, 8, 1
Number of protons87
Number of neutrons136

Other languages
SpanishFrancio
PortugueseFrâncio
FrenchFrancium
GermanFrancium
ItalianFrancio
RussianФранций
PolishFrans
Chinese
Arabicفرانسيوم
TurkishFransiyum
DutchFrancium


Periodic table of the elements
RadonFranciumRadium