Template:Infobox francium

Francium,  ₈₇Fr

General properties
Pronunciation	Template:Infobox element/pronunciation
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Francium in the periodic table
Template:Infobox element/periodic table
Atomic number (Z)	87
Group	Template:Infobox element/group
Period	period 7
Block	s-block
Element category	Template:Infobox element/category format
Electron configuration	[Rn] 7s1
Electrons per shell	2, 8, 18, 32, 18, 8, 1
Physical properties
Phase at STP	solid (predicted)
Melting point	? 300 K ​(30 °C, ​80 °F)
Boiling point	? 950 K ​(680 °C, ​1300 °F)
Density (near r.t.)	2.8–3.0 g/cm3 (extrapolated)
[[Vapor pressure|Template:Engvar pressure]] (extrapolated) Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: >0.79
[[Ionization energy|Template:Engvar energies]]	1st: 393 kJ/mol
Covalent radius	260 pm (extrapolated)
Van der Waals radius	348 pm (extrapolated)
Template:Infobox element/spectral lines
Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure (extrapolated)
Thermal conductivity	15 W/(m·K) (extrapolated)
Electrical resistivity	3 µΩ·m (calculated)
Magnetic ordering	Paramagnetic
CAS Number	7440-73-5
History
Naming	after France, homeland of the discoverer
Discovery and first isolation	Marguerite Perey (1939)
Main isotopes of francium
Template:Infobox element/isotopes table