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Isotopes of francium



Francium (Fr) has no stable isotopes. A standard atomic mass cannot be given.

Additional recommended knowledge

An isotope of francium occurring within the radioactive disintegration chain of actinium was known as:

  • actinium K : 223Fr

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
199Fr 87 112 199.00726(4) 16(7) ms 1/2+#
200Fr 87 113 200.00657(8) 24(10) ms 3+#
200mFr 60(110) keV 650(210) ms 10-#
201Fr 87 114 201.00386(8) 67(3) ms (9/2-)
202Fr 87 115 202.00337(5) 290(30) ms (3+)
202mFr 330(90)# keV 340(40) ms (10-)
203Fr 87 116 203.000925(17) 0.55(2) s (9/2-)#
204Fr 87 117 204.000653(26) 1.7(3) s (3+)
204m1Fr 50(4) keV 2.6(3) s (7+)
204m2Fr 326(4) keV 1.7(6) s (10-)
205Fr 87 118 204.998594(8) 3.80(3) s (9/2-)
206Fr 87 119 205.99867(3) ~16 s (2+,3+)
206m1Fr 190(40) keV 15.9(1) s (7+)
206m2Fr 730(40) keV 700(100) ms (10-)
207Fr 87 120 206.99695(5) 14.8(1) s 9/2-
208Fr 87 121 207.99714(5) 59.1(3) s 7+
209Fr 87 122 208.995954(16) 50.0(3) s 9/2-
210Fr 87 123 209.996408(24) 3.18(6) min 6+
211Fr 87 124 210.995537(23) 3.10(2) min 9/2-
212Fr 87 125 211.996202(28) 20.0(6) min 5+
213Fr 87 126 212.996189(8) 34.6(3) s 9/2-
214Fr 87 127 213.998971(9) 5.0(2) ms (1-)
214m1Fr 123(6) keV 3.35(5) ms (8-)
214m2Fr 638(6) keV 103(4) ns (11+)
214m3Fr 6477+Y keV 108(7) ns (33+)
215Fr 87 128 215.000341(8) 86(5) ns 9/2-
216Fr 87 129 216.003198(15) 0.70(2) µs (1-)
217Fr 87 130 217.004632(7) 16.8(19) µs 9/2-
218Fr 87 131 218.007578(5) 1.0(6) ms 1-
218m1Fr 86(4) keV 22.0(5) ms
218m2Fr 200(150)# keV high
219Fr 87 132 219.009252(8) 20(2) ms 9/2-
220Fr 87 133 220.012327(4) 27.4(3) s 1+
221Fr 87 134 221.014255(5) 4.9(2) min 5/2-
222Fr 87 135 222.017552(23) 14.2(3) min 2-
223Fr 87 136 223.0197359(26) 22.00(7) min 3/2(-)
224Fr 87 137 224.02325(5) 3.33(10) min 1-
225Fr 87 138 225.02557(3) 4.0(2) min 3/2-
226Fr 87 139 226.02939(11) 49(1) s 1-
227Fr 87 140 227.03184(11) 2.47(3) min 1/2+
228Fr 87 141 228.03573(22)# 38(1) s 2-
229Fr 87 142 229.03845(4) 50.2(4) s (1/2+)#
230Fr 87 143 230.04251(48)# 19.1(5) s
231Fr 87 144 231.04544(50)# 17.6(6) s (1/2+)#
232Fr 87 145 232.04977(69)# 5(1) s

Notes

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

  • Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
  • Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
  • Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
    • Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
    • National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
    • David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.


Isotopes of radon Isotopes of francium Isotopes of radium
Index to isotope pages
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_francium". A list of authors is available in Wikipedia.
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