Template:Infobox francium

Francium,  87Fr
General properties
PronunciationTemplate:Infobox element/pronunciation
Standard atomic weight (Ar, standard)Template:Infobox element/standard atomic weight
Mass numberTemplate:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Francium in the periodic table
Template:Infobox element/periodic table
Atomic number (Z)87
GroupTemplate:Infobox element/group
Periodperiod 7
Blocks-block
Element categoryTemplate:Infobox element/category format
Electron configuration[Rn] 7s1
Electrons per shell
2, 8, 18, 32, 18, 8, 1
Physical properties
Phase at STPsolid (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)[1]
[[Vapor pressure|Template:Engvar pressure]] (extrapolated)
Atomic properties
Oxidation statesTemplate:Infobox element/symbol-to-oxidation-state
ElectronegativityPauling scale: >0.79
[[Ionization energy|Template:Engvar energies]]
  • 1st: 393 kJ/mol[2]
Covalent radius260 pm (extrapolated)
Van der Waals radius348 pm (extrapolated)
Template:Infobox element/spectral lines
Other properties
Crystal structureTemplate:Infobox element/crystal structure
(extrapolated)
Thermal conductivity15 W/(m·K) (extrapolated)
Electrical resistivity3 µΩ·m (calculated)
Magnetic orderingParamagnetic
CAS Number7440-73-5
History
Namingafter France, homeland of the discoverer
Discovery and first isolationMarguerite Perey (1939)
Main isotopes of francium
Template:Infobox element/isotopes table
| references

Template:Infobox element/element navigation Template:Template reference list Expression error: Unrecognized word "template".

  1. Bonchev, Danail; Kamenska, Verginia (1981). "Predicting the Properties of the 113–120 Transactinide Elements". Journal of Physical Chemistry. American Chemical Society. 85 (9): 1177–1186. doi:10.1021/j150609a021.
  2. ISOLDE Collaboration, J. Phys. B 23, 3511 (1990) (PDF online)