Francium (87Fr) has no stable isotopes. A standard atomic weight cannot be given. Its most stable isotope is 223Fr with a half-life of 22 minutes, occurring in trace quantities in nature as an intermediate decay product of 235U.
Of elements whose most stable isotopes have been identified with certainty, francium is the most unstable. All elements with atomic number of 106 (seaborgium) or greater have most-stable-known isotopes shorter than that of francium, but as those elements have only a relatively small number of isotopes discovered, the possibility remains that undiscovered isotopes of these elements may have longer half-lives.
^( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
^# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
^ abc# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
^ abKondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
^Fisichella, M.; Musumarra, A.; Farinon, F.; Nociforo, C.; Del Zoppo, A.; Figuera, P.; La Cognata, M.; Pellegriti, M. G.; Scuderi, V.; Torresi, D.; Strano, E. (2013-07-24). "Determination of the half-life of 213Fr with high precision". Physical Review C. 88 (1). American Physical Society (APS): 011303. Bibcode:2013PhRvC..88a1303F. doi:10.1103/physrevc.88.011303. ISSN 0556-2813.
Isotope masses from:
Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
Half-life, spin, and isomer data selected from the following sources.
Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
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Francium 87Fr has no stable isotopes A standard atomic weight cannot be given Its most stable isotope is 223Fr with a half life of 22 minutes occurring in trace quantities in nature as an intermediate decay product of 235U Isotopes of francium 87Fr Main isotopes 1 Decay abun dance half life t1 2 mode pro duct 212Fr synth 20 0 min b 212Rn a 208At 221Fr trace 4 8 min a 217At 222Fr synth 14 2 min b 222Ra 223Fr trace 22 00 min b 223Ra a 219Atviewtalkedit Of elements whose most stable isotopes have been identified with certainty francium is the most unstable All elements with atomic number of 106 seaborgium or greater have most stable known isotopes shorter than that of francium but as those elements have only a relatively small number of isotopes discovered the possibility remains that undiscovered isotopes of these elements may have longer half lives List of isotopes editNuclide n 1 Historicname Z N Isotopic mass Da n 2 n 3 Half life n 4 Decaymode n 5 Daughterisotope Spin andparity n 6 n 4 Isotopicabundance Excitation energy n 4 197Fr 87 110 197 01101 6 2 3 19 ms a 193At 7 2 198Fr 87 111 198 01028 3 15 3 ms a 194At 3 199Fr 87 112 199 00726 4 16 7 ms a 195At 1 2 200Fr 87 113 200 00657 8 24 10 ms a 196At 3 200mFr 60 110 keV 190 120 ms a 196At 10 201Fr 87 114 201 00386 8 67 3 ms a 99 197At 9 2 b 1 201Rn 202Fr 87 115 202 00337 5 290 30 ms a 97 198At 3 b 3 202Rn 202mFr 330 90 keV 340 40 ms a 97 198At 10 b 3 202Rn 203Fr 87 116 203 000925 17 0 55 2 s a 95 199At 9 2 b 5 203Rn 204Fr 87 117 204 000653 26 1 7 3 s a 96 200At 3 b 4 204Rn 204m1Fr 50 4 keV 2 6 3 s a 90 200At 7 b 10 204Rn 204m2Fr 326 4 keV 1 7 6 s 10 205Fr 87 118 204 998594 8 3 80 3 s a 99 201At 9 2 b 1 205Rn 206Fr 87 119 205 99867 3 16 s b 58 206Rn 2 3 a 42 202At 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 a 95 203At 9 2 b 5 207Rn 208Fr 87 121 207 99714 5 59 1 3 s a 90 204At 7 b 10 208Rn 209Fr 87 122 208 995954 16 50 0 3 s a 89 205At 9 2 b 11 209Rn 210Fr 87 123 209 996408 24 3 18 6 min a 60 206At 6 b 40 210Rn 211Fr 87 124 210 995537 23 3 10 2 min a 80 207At 9 2 b 20 211Rn 212Fr 87 125 211 996202 28 20 0 6 min b 57 212Rn 5 a 43 208At 213Fr 87 126 212 996189 8 34 14 6 s 2 a 99 45 209At 9 2 b 55 213Rn 214Fr 87 127 213 998971 9 5 0 2 ms a 210At 1 214m1Fr 123 6 keV 3 35 5 ms a 210At 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 a 211At 9 2 216Fr 87 129 216 003198 15 0 70 2 ms a 212At 1 216mFr 219 6 keV 850 30 ns a n 7 212At 9 217Fr 87 130 217 004632 7 16 8 19 ms a 213At 9 2 218Fr 87 131 218 007578 5 1 0 6 ms a 214At 1 218m1Fr 86 4 keV 22 0 5 ms a 214At 8 218m2Fr 200 150 keV high 219Fr 87 132 219 009252 8 20 2 ms a 215At 9 2 220Fr 87 133 220 012327 4 27 4 3 s a 99 65 216At 1 b 35 220Ra 221Fr 87 134 221 014255 5 4 9 2 min a 99 9 217At 5 2 Trace n 8 b 1 221Ra CD 8 79 10 11 n 9 207Tl14C 222Fr 87 135 222 017552 23 14 2 3 min b 222Ra 2 223Fr Actinium K 87 136 223 0197359 26 22 00 7 min b 99 99 223Ra 3 2 Trace n 10 a 006 219At 224Fr 87 137 224 02325 5 3 33 10 min b 224Ra 1 225Fr 87 138 225 02557 3 4 0 2 min b 225Ra 3 2 226Fr 87 139 226 02939 11 49 1 s b 226Ra 1 227Fr 87 140 227 03184 11 2 47 3 min b 227Ra 1 2 228Fr 87 141 228 03573 22 38 1 s b 228Ra 2 229Fr 87 142 229 03845 4 50 2 4 s b 229Ra 1 2 230Fr 87 143 230 04251 48 19 1 5 s b 230Ra 231Fr 87 144 231 04544 50 17 6 6 s b 231Ra 1 2 232Fr 87 145 232 04977 69 5 1 s b 232Ra 233Fr 87 146 233 052518 21 900 100 ms b 233Ra 1 2 This table header amp footer view mFr Excited nuclear isomer Uncertainty 1s is given in concise form in parentheses after the corresponding last digits Atomic mass marked value and uncertainty derived not from purely experimental data but at least partly from trends from the Mass Surface TMS a b c Values marked are not purely derived from experimental data but at least partly from trends of neighboring nuclides TNN Modes of decay CD Cluster decay IT Isomeric transition spin value Indicates spin with weak assignment arguments Theoretically capable of b decay to 216Rn 1 Intermediate decay product of 237Np The nuclide with the lowest atomic number known to undergo cluster decay Intermediate decay product of 235UReferences edit a b Kondev F G Wang M Huang W J Naimi S Audi G 2021 The NUBASE2020 evaluation of nuclear properties PDF Chinese Physics C 45 3 030001 doi 10 1088 1674 1137 abddae Fisichella M Musumarra A Farinon F Nociforo C Del Zoppo A Figuera P La Cognata M Pellegriti M G Scuderi V Torresi D Strano E 2013 07 24 Determination of the half life of 213Fr with high precision Physical Review C 88 1 American Physical Society APS 011303 Bibcode 2013PhRvC 88a1303F doi 10 1103 physrevc 88 011303 ISSN 0556 2813 Isotope masses from Audi Georges Bersillon Olivier Blachot Jean Wapstra Aaldert Hendrik 2003 The NUBASE evaluation of nuclear and decay properties Nuclear Physics A 729 3 128 Bibcode 2003NuPhA 729 3A doi 10 1016 j nuclphysa 2003 11 001 Half life spin and isomer data selected from the following sources Audi Georges Bersillon Olivier Blachot Jean Wapstra Aaldert Hendrik 2003 The NUBASE evaluation of nuclear and decay properties Nuclear Physics A 729 3 128 Bibcode 2003NuPhA 729 3A doi 10 1016 j nuclphysa 2003 11 001 National Nuclear Data Center NuDat 2 x database Brookhaven National Laboratory Holden Norman E 2004 11 Table of the Isotopes In Lide David R ed CRC Handbook of Chemistry and Physics 85th ed Boca Raton Florida CRC Press ISBN 978 0 8493 0485 9 Retrieved from https en wikipedia org w index php title Isotopes of francium amp oldid 1222928491 Francium 210, wikipedia, wiki, book, books, library,
