Technical data for Francium

Overview
NameFrancium
SymbolFr
Atomic Number87
Atomic Weight223[note]
DensityN/A
Melting PointN/A
Boiling PointN/A

Thermal properties
PhaseSolid
Melting PointN/A
Boiling PointN/A
Absolute Melting PointN/A
Absolute Boiling PointN/A
Heat of Fusion2 kJ/mol
Heat of Vaporization65 kJ/mol
Heat of CombustionN/A
Specific HeatN/A
Thermal ConductivityN/A
Thermal ExpansionN/A

Bulk physical properties
DensityN/A
Density (Liquid)N/A
Thermal ConductivityN/A
Thermal ExpansionN/A

Reactivity
Valence3
Electronegativity0.7
ElectronAffinityN/A
Ionization Energies
380 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blocks
Group1
Period7
Electron Configuration[Rn]7s1
ColorSilver
Discovery
1939 in France
Gas phaseN/A
CAS NumberCAS7440-73-5

Electrical properties
Electrical TypeN/A
Electrical ConductivityN/A
ResistivityN/A
Superconducting PointN/A

Magnetic properties
Magnetic TypeN/A
Curie PointN/A
Mass Magnetic SusceptibilityN/A
Molar Magnetic SusceptibilityN/A
Volume Magnetic SusceptibilityN/A

Abundances
% in UniverseN/A
% in SunN/A
% in MeteoritesN/A
% in Earth's CrustN/A
% in OceansN/A
% in HumansNone

Atomic dimensions and structure
Atomic RadiusN/A
Covalent RadiusN/A
Van der Waals RadiusN/A
Crystal StructureN/A
Lattice AnglesN/A
Lattice ConstantsN/A
Space Group NameN/A
Space Group NumberN/A

Nuclear Properties
Half-Life21.7 m
Lifetime31.7 m

Notes on the properties of Francium:
Atomic Weight: Atomic mass number given for longest lived isotope.