Electronic data		Thermal data		Steric data
Shells: 2,8,18,32,18,8,1 Orbitals: [Rn] 7s1 Electronegativity: 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: Cubic: Body centered

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
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

Legend

Name origin:	Named for France, the nation of its discovery.
Description:	Highly rare and unstable, radioactive metal.
Discovered by:	Marguerite Derey
Year:	1939
Place:	France
Sources:	Formed by decay of actinium. Chemical properties similar to cesium. Decays to radium or astatine.
Use(s):	Since its isotopes have such short half-lives there are no commercially significant compounds of francium.