Template:Infobox francium/sandbox

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[[Category:Template:Pagetype with short description]]

Francium, 87Fr
Francium
Pronunciation/ˈfrænsiəm/ (Template:Respell)
Mass number[223]
Francium in the periodic table
Template:Periodic table (32 columns, micro) Cs

Fr

(Uue)
radonfranciumradium
Atomic number (Z)87
Groupgroup 1: H and alkali metals
Periodperiod 7
Block  s-block
Electron configuration[Rn] 7s1
Electrons per shell2, 8, 18, 32, 18, 8, 1
Physical properties
Phase at STPsolid presumably
Melting point? 300 K ​(27 °C, ​80 °F)
Boiling point? 950 K ​(677 °C, ​1250 °F)
Density (near r.t.)1.87 g/cm3 (extrapolated)
Heat of fusionca. 2 kJ/mol
Heat of vaporizationca. 65 kJ/mol
Vapor pressure (extrapolated)
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 404 454 519 608 738 946
Atomic properties
Oxidation states+1 (a strongly basic oxide)
ElectronegativityPauling scale: 0.7
Ionization energies
  • 1st: 380 kJ/mol
Covalent radius260 pm (extrapolated)
Van der Waals radius348 pm (extrapolated)
Other properties
Natural occurrencefrom decay
Crystal structurebody-centered cubic (bcc)
Body-centered cubic crystal structure for francium

(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
[[Isotope|IsoTemplate:Shytope]] [[Natural abundance|AbunTemplate:Shydance]] Half-life (t1/2) Decay mode [[Decay product|ProTemplate:Shyduct]]
221Fr trace 4.8 min α 217At
222Fr syn 14.2 min β 222Ra
223Fr trace 22.00 min β 223Ra
α 219At
Category Category: Francium
| references

References

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