Isotopen van francium
Het chemisch element francium (Fr), met een atoommassa van ongeveer 223 u, bezit geen stabiele isotopen en wordt dus geclassificeerd als radioactief element. Van de 34 radio-isotopen komen in de natuur alleen sporen voor van de 223Fr, dat onderdeel is van de vervalreeks van uranium-235 en een halfwaardetijd heeft van 22 minuten, en daarmee de langstlevende isotoop van francium is.
Overzicht
| Nuclide | Z (p) | N (n) | Isotopische massa (u) | Halveringstijd | Radioactief verval | VP | Kernspin | Isotopische verhouding (molfractie) |
Natuurlijk voorkomen (molfractie) |
|---|---|---|---|---|---|---|---|---|---|
| Excitatie-energie | |||||||||
| 199Fr | 87 | 112 | 199,00726(4) | 16(7) ms | 1/2+ | ||||
| 200Fr | 87 | 113 | 200,00657(8) | 24(10) ms | α | 196At | 3+ | ||
| 200mFr | 60(110) keV | 650(210) ms | α | 196At | 10− | ||||
| IT (zelden) | 200Fr | ||||||||
| 201Fr | 87 | 114 | 201,00386(8) | 67(3) ms | α (99%) | 197At | (9/2−) | ||
| β+ (1%) | 201Rn | ||||||||
| 202Fr | 87 | 115 | 202,00337(5) | 290(30) ms | α (97%) | 198At | (3+) | ||
| β+ (3%) | 202Rn | ||||||||
| 202mFr | 330(90) keV | 340(40) ms | α (97%) | 198At | (10−) | ||||
| β+ (3%) | 202Rn | ||||||||
| 203Fr | 87 | 116 | 203,000925(17) | 0,55(2) s | α (95%) | 199At | (9/2−) | ||
| β+ (5%) | 203Rn | ||||||||
| 204Fr | 87 | 117 | 204,000653(26) | 1,7(3) s | α (96%) | 200At | (3+) | ||
| β+ (4%) | 204Rn | ||||||||
| 204m1Fr | 50(4) keV | 2,6(3) s | α (90%) | 200At | (7+) | ||||
| β+ (10%) | 204Rn | ||||||||
| 204m2Fr | 326(4) keV | 1,7(6) s | (10−) | ||||||
| 205Fr | 87 | 118 | 204,998594(8) | 3,80(3) s | α (99%) | 201At | (9/2−) | ||
| β+ (1%) | 205Rn | ||||||||
| 206Fr | 87 | 119 | 205,99867(3) | ± 16 s | β+ (58%) | 206Rn | (2+, 3+) | ||
| α (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 | α (95%) | 203At | 9/2− | ||
| β+ (5%) | 207Rn | ||||||||
| 208Fr | 87 | 121 | 207,99714(5) | 59,1(3) s | α (90%) | 204At | 7+ | ||
| β+ (10%) | 208Rn | ||||||||
| 209Fr | 87 | 122 | 208,995954(16) | 50,0(3) s | α (89%) | 205At | 9/2− | ||
| β+ (11%) | 209Rn | ||||||||
| 210Fr | 87 | 123 | 209,996408(24) | 3,18(6) min | α (60%) | 206At | 6+ | ||
| β+ (40%) | 210Rn | ||||||||
| 211Fr | 87 | 124 | 210,995537(23) | 3,10(2) min | α (80%) | 207At | 9/2− | ||
| β+ (20%) | 211Rn | ||||||||
| 212Fr | 87 | 125 | 211,996202(28) | 20,0(6) min | β+ (57%) | 212Rn | 5+ | ||
| α (43%) | 208At | ||||||||
| 213Fr | 87 | 126 | 212,996189(8) | 34,6(3) s | α (99,45%) | 209At | 9/2− | ||
| β+ (0,55%) | 213Rn | ||||||||
| 214Fr | 87 | 127 | 213,998971(9) | 5,0(2) ms | α | 210At | (1−) | ||
| 214m1Fr | 123(6) keV | 3,35(5) ms | α | 210At | (8−) | ||||
| 214m2Fr | 638(6) keV | 103(4) ns | (11+) | ||||||
| 214m3Fr | 6477 keV | 108(7) ns | (33+) | ||||||
| 215Fr | 87 | 128 | 215,000341(8) | 86(5) ns | α | 211At | 9/2− | ||
| 216Fr | 87 | 129 | 216,003198(15) | 0,70(2) µs | α | 212At | (1−) | ||
| β+ (2 × 10−7%) | 216Rn | ||||||||
| 217Fr | 87 | 130 | 217,004632(7) | 16,8(19) µs | α | 213At | 9/2− | ||
| 218Fr | 87 | 131 | 218,007578(5) | 1,0(6) ms | α | 214At | 1− | ||
| 218m1Fr | 86(4) keV | 22,0(5) ms | α | 214At | |||||
| IT (zelden) | 218Fr | ||||||||
| 218m2Fr | 200(150) keV | ||||||||
| 219Fr | 87 | 132 | 219,009252(8) | 20(2) ms | α | 215At | 9/2− | ||
| 220Fr | 87 | 133 | 220,012327(4) | 27,4(3) s | α (99,65%) | 216At | 1+ | ||
| β− (0,35%) | 220Ra | ||||||||
| 221Fr | 87 | 134 | 221,014255(5) | 4,9(2) min | α (99,9%) | 217At | 5/2− | ||
| β− (0,1%) | 221Ra | ||||||||
| CV (8,79 × −11%) | 207Tl, 14C | ||||||||
| 222Fr | 87 | 135 | 222,017552(23) | 14,2(3) min | β− | 222Ra | 2− | ||
| 223Fr | 87 | 136 | 223,0197359(26) | 22,00(7) min | β− (99,99%) | 223Ra | 3/2− | sporen | |
| α (0,006%) | 219At | ||||||||
| 224Fr | 87 | 137 | 224,02325(5) | 3,33(10) min | β− | 224Ra | 1− | ||
| 225Fr | 87 | 138 | 225,02557(3) | 4,0(2) min | β− | 225Ra | 3/2− | ||
| 226Fr | 87 | 139 | 226,02939(11) | 49(1) s | β− | 226Ra | 1− | ||
| 227Fr | 87 | 140 | 227,03184(11) | 2,47(3) min | β− | 227Ra | 1/2+ | ||
| 228Fr | 87 | 141 | 228,03573(22) | 38(1) s | β− | 228Ra | 2− | ||
| 229Fr | 87 | 142 | 229,03845(4) | 50,2(4) s | β− | 229Ra | (1/2+) | ||
| 230Fr | 87 | 143 | 230,04251(48) | 19,1(5) s | β− | 230Ra | |||
| 231Fr | 87 | 144 | 231,04544(50) | 17,6(6) s | β− | 231Ra | (1/2+) | ||
| 232Fr | 87 | 145 | 232,04977(69) | 5(1) s | β− | 232Ra | |||
Overzicht van isotopen per element
| 1 | 18 | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | H | 2 | Periodiek systeem | 13 | 14 | 15 | 16 | 17 | He | |||||||||
| 2 | Li | Be | De links verwijzen naar isotopen per element | B | C | N | O | F | Ne | |||||||||
| 3 | Na | Mg | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | Al | Si | P | S | Cl | Ar |
| 4 | K | Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Br | Kr |
| 5 | Rb | Sr | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd | In | Sn | Sb | Te | I | Xe |
| 6 | Cs | Ba | ↓ | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | Tl | Pb | Bi | Po | At | Rn |
| 7 | Fr | Ra | ↓↓ | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og |
| Lanthaniden | La | Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | |||
| Actiniden | Ac | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr | |||
Zie ook
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