Element Francium

Francium ElementElement Francium atom is an alkali metal atom.
A radioactive alkali metal with the atomic symbol Fr, and atomic number 87. The mass numbers of known isotopes are 204-213, 217-224. Its valence is +1.
Prior to its discovery, it was referred to as eka-caesium. It is extremely radioactive; its most stable isotope, francium-223 (originally called actinium K after the natural decay chain it appears in), has a half-life of only 22 minutes.

Names and Identifiers

Chemical Formula:Fr
Molecular Weight:223.00000 g/mol
EC Number :n/a
MDL Number:n/a
Other Names:n/a
PubChem CID:6328145
IUPAC Name:Francium
Canonical SMILES:[Fr]
ICSC Number:n/a

Physical & Chemical Properties

Density:2.48 g/cm³
Boiling Point:890 K ​(620 °C, ​1150 °F)
Melting Point:281.0 K ​(8.0 °C, ​46.4 °F)
Molecular Formula:Fr
Flash Point:n/a
Exact Mass:223.02000

Francium has seven metastable nuclear isomers.

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
210Fr209.996403.2 mα to 206At; EC to 210Rn64.4
211Fr210.995533.10 mα to 207At; EC to 211Rn9/24.0
212Fr211.9961820 mα to 208At; EC to 212Rn54.6
213Fr212.9961734.6 sα to 209At; EC to 213Rn9/24.0
214Fr213.998950.0051 sα to 210At1
215Fr215.000330.0000012 sα to 211At9/2
216Fr216.003190.000007 sα to 212At; EC to 216Rn
217Fr217.004620.00016 sα to 213At
218Fr218.007560.001 sα to 214At1
219Fr219.009240.021 sα to 215At9/2
220Fr220.0123127.4 sα to 216At; β to 220Ra1
221Fr221.014254.8 mα to 217At; β to 221Ra; 14C5/21.58
222Fr222.0175414.3 mβ to 222Ra20.63
223Fr223.019733 (4)22 mα to 219At; β to 223Ra3/21.17
224Fr224.023233 mβ to 224Ra10.40
225Fr225.025613.9 mβ to 225Ra3/21.07
226Fr226.029349 sβ to 226Ra10.071
227Fr227.03182.48 mβ to 227Ra1/21.50

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