Elektronische Daten		Thermische Daten		Sterische Daten
Schalen: 2,8,18,32,18,8,1 Orbitale: [Rn] 7s1 Elektronegativität: 0.9, 0.7 1. Ionization potential: -- eV 2. Ionization potential: -- eV 3. Ionization potential: -- eV Oxidation states: 1 Electrical conductivity: 0.03 10^6		Melting point: 27 °C Boiling point: 677 °C Specific heat: -- J/gK Heat of fusion: -- kJ/mol Heat of vaporization: -- kJ/mol Thermal conductivity: 0.15 W/cmK		Atomic radius: -- Å Ionic radius: -- Å () Covalent radius: -- Å Atomic volume: -- cm³/mol Density (293 K): -- g/cm³ Crystal structure: Kubisch körperzentriert

Nuklid	Häufigkeit [%]	Masse	Spin	Halbwertszeit	Zerfallsmodus	Zerfallsreihe
212Fr	0	211.996	5	20m	EC,+,	View
221Fr	0	221.014	5/2	4.80m		View
223Fr	0	223.02	3/2	21.8m	-,	View

Legende

Herkunft des Namen:
Beschreibung:	Highly rare and unstable, radioactive metal.
Entdeckt von:	Marguerite Derey
Jahr:	1939
Ort:	Frankreich
Quelle(n):	Formed by decay of actinium. Chemical properties similar to cesium. Decays to radium or astatine.
Verwendung(en):	Since its isotopes have such short half-lives there are no commercially significant compounds of francium.