# 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 $^{223}$Fr, 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) |||
| $^{199}$Fr | 87 | 112 | 199,00726(4) | 16(7) ms | | | 1/2$^+$ | |
| $^{200}$Fr | 87 | 113 | 200,00657(8) | 24(10) ms | α | $^{196}$At | 3$^+$ | |
| $^{200m}$Fr | 60(110) keV | 60(110) keV | 60(110) keV | 650(210) ms | α | $^{196}$At | 10$^−$ | |
| $^{200m}$Fr | 60(110) keV | 60(110) keV | 60(110) keV | 650(210) ms | IT (zelden) | $^{200}$Fr | 10$^−$ | |
| $^{201}$Fr | 87 | 114 | 201,00386(8) | 67(3) ms | α (99%) | $^{197}$At | (9/2$^−$) | |
| $^{201}$Fr | 87 | 114 | 201,00386(8) | 67(3) ms | β$^+$ (1%) | $^{201}$Rn | (9/2$^−$) | |
| $^{202}$Fr | 87 | 115 | 202,00337(5) | 290(30) ms | α (97%) | $^{198}$At | (3$^+$) | |
| $^{202}$Fr | 87 | 115 | 202,00337(5) | 290(30) ms | β$^+$ (3%) | $^{202}$Rn | (3$^+$) | |
| $^{202m}$Fr | 330(90) keV | 330(90) keV | 330(90) keV | 340(40) ms | α (97%) | $^{198}$At | (10$^−$) | |
| $^{202m}$Fr | 330(90) keV | 330(90) keV | 330(90) keV | 340(40) ms | β$^+$ (3%) | $^{202}$Rn | (10$^−$) | |
| $^{203}$Fr | 87 | 116 | 203,000925(17) | 0,55(2) s | α (95%) | $^{199}$At | (9/2$^−$) | |
| $^{203}$Fr | 87 | 116 | 203,000925(17) | 0,55(2) s | β$^+$ (5%) | $^{203}$Rn | (9/2$^−$) | |
| $^{204}$Fr | 87 | 117 | 204,000653(26) | 1,7(3) s | α (96%) | $^{200}$At | (3$^+$) | |
| $^{204}$Fr | 87 | 117 | 204,000653(26) | 1,7(3) s | β$^+$ (4%) | $^{204}$Rn | (3$^+$) | |
| $^{204m1}$Fr | 50(4) keV | 50(4) keV | 50(4) keV | 2,6(3) s | α (90%) | $^{200}$At | (7$^+$) | |
| $^{204m1}$Fr | 50(4) keV | 50(4) keV | 50(4) keV | 2,6(3) s | β$^+$ (10%) | $^{204}$Rn | (7$^+$) | |
| $^{204m2}$Fr | 326(4) keV | 326(4) keV | 326(4) keV | 1,7(6) s | | | (10$^−$) | |
| $^{205}$Fr | 87 | 118 | 204,998594(8) | 3,80(3) s | α (99%) | $^{201}$At | (9/2$^−$) | |
| $^{205}$Fr | 87 | 118 | 204,998594(8) | 3,80(3) s | β$^+$ (1%) | $^{205}$Rn | (9/2$^−$) | |
| $^{206}$Fr | 87 | 119 | 205,99867(3) | ± 16 s | β$^+$ (58%) | $^{206}$Rn | (2$^+$, 3$^+$) | |
| $^{206}$Fr | 87 | 119 | 205,99867(3) | ± 16 s | α (42%) | $^{202}$At | (2$^+$, 3$^+$) | |
| $^{206m1}$Fr | 190(40) keV | 190(40) keV | 190(40) keV | 15,9(1) s | | | (7$^+$) | |
| $^{206m2}$Fr | 730(40) keV | 730(40) keV | 730(40) keV | 700(100) ms | | | (10$^−$) | |
| $^{207}$Fr | 87 | 120 | 206,99695(5) | 14,8(1) s | α (95%) | $^{203}$At | 9/2$^−$ | |
| $^{207}$Fr | 87 | 120 | 206,99695(5) | 14,8(1) s | β$^+$ (5%) | $^{207}$Rn | 9/2$^−$ | |
| $^{208}$Fr | 87 | 121 | 207,99714(5) | 59,1(3) s | α (90%) | $^{204}$At | 7$^+$ | |
| $^{208}$Fr | 87 | 121 | 207,99714(5) | 59,1(3) s | β$^+$ (10%) | $^{208}$Rn | 7$^+$ | |
| $^{209}$Fr | 87 | 122 | 208,995954(16) | 50,0(3) s | α (89%) | $^{205}$At | 9/2$^−$ | |
| $^{209}$Fr | 87 | 122 | 208,995954(16) | 50,0(3) s | β$^+$ (11%) | $^{209}$Rn | 9/2$^−$ | |
| $^{210}$Fr | 87 | 123 | 209,996408(24) | 3,18(6) min | α (60%) | $^{206}$At | 6$^+$ | |
| $^{210}$Fr | 87 | 123 | 209,996408(24) | 3,18(6) min | β$^+$ (40%) | $^{210}$Rn | 6$^+$ | |
| $^{211}$Fr | 87 | 124 | 210,995537(23) | 3,10(2) min | α (80%) | $^{207}$At | 9/2$^−$ | |
| $^{211}$Fr | 87 | 124 | 210,995537(23) | 3,10(2) min | β$^+$ (20%) | $^{211}$Rn | 9/2$^−$ | |
| $^{212}$Fr | 87 | 125 | 211,996202(28) | 20,0(6) min | β$^+$ (57%) | $^{212}$Rn | 5$^+$ | |
| $^{212}$Fr | 87 | 125 | 211,996202(28) | 20,0(6) min | α (43%) | $^{208}$At | 5$^+$ | |
| $^{213}$Fr | 87 | 126 | 212,996189(8) | 34,6(3) s | α (99,45%) | $^{209}$At | 9/2$^−$ | |
| $^{213}$Fr | 87 | 126 | 212,996189(8) | 34,6(3) s | β$^+$ (0,55%) | $^{213}$Rn | 9/2$^−$ | |
| $^{214}$Fr | 87 | 127 | 213,998971(9) | 5,0(2) ms | α | $^{210}$At | (1$^−$) | |
| $^{214m1}$Fr | 123(6) keV | 123(6) keV | 123(6) keV | 3,35(5) ms | α | $^{210}$At | (8$^−$) | |
| $^{214m2}$Fr | 638(6) keV | 638(6) keV | 638(6) keV | 103(4) ns | | | (11$^+$) | |
| $^{214m3}$Fr | 6477 keV | 6477 keV | 6477 keV | 108(7) ns | | | (33$^+$) | |
| $^{215}$Fr | 87 | 128 | 215,000341(8) | 86(5) ns | α | $^{211}$At | 9/2$^−$ | |
| $^{216}$Fr | 87 | 129 | 216,003198(15) | 0,70(2) µs | α | $^{212}$At | (1$^−$) | |
| $^{216}$Fr | 87 | 129 | 216,003198(15) | 0,70(2) µs | β$^+$ (2 × 10$^{−7}$%) | $^{216}$Rn | (1$^−$) | |
| $^{217}$Fr | 87 | 130 | 217,004632(7) | 16,8(19) µs | α | $^{213}$At | 9/2$^−$ | |
| $^{218}$Fr | 87 | 131 | 218,007578(5) | 1,0(6) ms | α | $^{214}$At | 1$^−$ | |
| $^{218m1}$Fr | 86(4) keV | 86(4) keV | 86(4) keV | 22,0(5) ms | α | $^{214}$At | | |
| $^{218m1}$Fr | 86(4) keV | 86(4) keV | 86(4) keV | 22,0(5) ms | IT (zelden) | $^{218}$Fr | | |
| $^{218m2}$Fr | 200(150) keV | 200(150) keV | 200(150) keV | | | | | |
| $^{219}$Fr | 87 | 132 | 219,009252(8) | 20(2) ms | α | $^{215}$At | 9/2$^−$ | |
| $^{220}$Fr | 87 | 133 | 220,012327(4) | 27,4(3) s | α (99,65%) | $^{216}$At | 1$^+$ | |
| $^{220}$Fr | 87 | 133 | 220,012327(4) | 27,4(3) s | β$^−$ (0,35%) | $^{220}$Ra | 1$^+$ | |
| $^{221}$Fr | 87 | 134 | 221,014255(5) | 4,9(2) min | α (99,9%) | $^{217}$At | 5/2$^−$ | |
| $^{221}$Fr | 87 | 134 | 221,014255(5) | 4,9(2) min | β$^−$ (0,1%) | $^{221}$Ra | 5/2$^−$ | |
| $^{221}$Fr | 87 | 134 | 221,014255(5) | 4,9(2) min | CV (8,79 × $^{−11}$%) | $^{207}$Tl, $^{14}$C | 5/2$^−$ | |
| $^{222}$Fr | 87 | 135 | 222,017552(23) | 14,2(3) min | β$^−$ | $^{222}$Ra | 2$^−$ | |
| $^{223}$Fr | 87 | 136 | 223,0197359(26) | 22,00(7) min | β$^−$ (99,99%) | $^{223}$Ra | 3/2$^−$ | sporen |
| $^{223}$Fr | 87 | 136 | 223,0197359(26) | 22,00(7) min | α (0,006%) | $^{219}$At | 3/2$^−$ | sporen |
| $^{224}$Fr | 87 | 137 | 224,02325(5) | 3,33(10) min | β$^−$ | $^{224}$Ra | 1$^−$ | |
| $^{225}$Fr | 87 | 138 | 225,02557(3) | 4,0(2) min | β$^−$ | $^{225}$Ra | 3/2$^−$ | |
| $^{226}$Fr | 87 | 139 | 226,02939(11) | 49(1) s | β$^−$ | $^{226}$Ra | 1$^−$ | |
| $^{227}$Fr | 87 | 140 | 227,03184(11) | 2,47(3) min | β$^−$ | $^{227}$Ra | 1/2$^+$ | |
| $^{228}$Fr | 87 | 141 | 228,03573(22) | 38(1) s | β$^−$ | $^{228}$Ra | 2$^−$ | |
| $^{229}$Fr | 87 | 142 | 229,03845(4) | 50,2(4) s | β$^−$ | $^{229}$Ra | (1/2$^+$) | |
| $^{230}$Fr | 87 | 143 | 230,04251(48) | 19,1(5) s | β$^−$ | $^{230}$Ra | | |
| $^{231}$Fr | 87 | 144 | 231,04544(50) | 17,6(6) s | β$^−$ | $^{231}$Ra | (1/2$^+$) | |
| $^{232}$Fr | 87 | 145 | 232,04977(69) | 5(1) s | β$^−$ | $^{232}$Ra | | |