Template:Infobox francium

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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
Melting point300 K ​(27 °C, ​81 °F)
Boiling point950 K ​(677 °C, ​1251 °F)
Density (near r.t.)2.48 g/cm3 (estimated)[1]
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: >0.79
Ionization energies
  • 1st: 393 kJ/mol[2]
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]]
212Fr syn 20.0 min β+ 212Rn
α 208At
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

[[Category:Infobox templates|Template:Remove first word]]

data m.p. cat
in calc from C diff report ref
C 27
K 300 300 0
F 81 81 0 Template:Subpage other
max precision 0
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input C: 27, K: 300, F: 81
comment
data b.p. cat
in calc from C diff report ref
C 677
K 950 950 0
F 1251 1251 0 Template:Subpage other
max precision 0
WD Template:Wikidata Script error: No such module "EditAtWikidata". Template:Wikidata
input C: 677, K: 950, F: 1251
comment
Rn ←

i'box Rn

iso
87
Fr (E)
→ Ra

i'box Ra

  Data sets read by {{Infobox element}}
Name and identifiers
Top image (caption, alt)
Pronunciation
Category (enwiki)
Standard atomic weight
  most stable isotope
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Term symbol * (cmt, ref)
Wikidata *
* Not used in {{Infobox element}} (2019-02-03)
See also {{Infobox element/symbol-to--navbox}}

References

  1. Lavrukhina, Avgusta Konstantinovna; Pozdnyakov, Aleksandr Aleksandrovich (1970). Analytical Chemistry of Technetium, Promethium, Astatine, and Francium. Translated by R. Kondor. Ann Arbor–Humphrey Science Publishers. p. 269. ISBN 978-0-250-39923-9.
  2. ISOLDE Collaboration, J. Phys. B 23, 3511 (1990) (PDF online)

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