Франциумот (87Fr) нема стабилни изотопи, па затоа не може да се даде стандардна атомска тежина. Неговиот најстабилен изотоп е 223Fr со полуживот од 22 минути, кој се јавува во трагови во природата како распаден меѓупроизвод од 235U.
Од елементите чии најстабилни изотопи се со сигурност идентификувани, франциумот е најнестабилен. Сите елементи со атомски број 106 (сиборгиум) или поголем имаат најстабилни познати изотопи пократковечни од оние на франциумот, но бидејќи тие елементи имаат само релативно мал број на откриени изотопи, останува можноста дека неоткриените изотопи на овие елементи може да имаат подолг полуживот.
Список на изотопите
|-id=Франциум-197 | 197Fr | | style="text-align:right" | 87 | style="text-align:right" | 110 | 197,01101(6) | 2,3(19) мс | α | 193At | (7/2−) | |-id=Франциум-198 | 198Fr | | style="text-align:right" | 87 | style="text-align:right" | 111 | 198,01028(3) | 15(3) мс | α | 194At | 3+# | |-id=Франциум-199 | 199Fr | | style="text-align:right" | 87 | style="text-align:right" | 112 | 199,007269(15) | 16(7) мс | α | 195At | 1/2+# | |-id=Франциум-200 | 200Fr | | style="text-align:right" | 87 | style="text-align:right" | 113 | 200,00658(3) | 24(10) мс | α | 196At | 3+# | |-id=Франциум-200m | style="text-indent:1em" | 200mFr | | colspan="3" style="text-indent:2em" | 60(110) keV | 190(120) мс | α | 196At | 10−# | |-id=Франциум-201 | rowspan=2|201Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 114 | rowspan=2|201,003852(10) | rowspan=2|67(3) мс | α (99%) | 197At | rowspan=2|(9/2−) | rowspan=2| |- | β+ (1%) | 201Rn |-id=Франциум-202 | rowspan=2|202Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 115 | rowspan=2|202,003330(6) | rowspan=2|290(30) мс | α (97%) | 198At | rowspan=2|(3+) | rowspan=2| |- | β+ (3%) | 202Rn |-id=Франциум-202m | rowspan=2 style="text-indent:1em" | 202mFr | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 330(90)# keV | rowspan=2|340(40) мс | α (97%) | 198At | rowspan=2|(10−) | rowspan=2| |- | β+ (3%) | 202Rn |-id=Франциум-203 | rowspan=2|203Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 116 | rowspan=2|203,000941(7) | rowspan=2|0,55(2) с | α (95%) | 199At | rowspan=2|(9/2−)# | rowspan=2| |- | β+ (5%) | 203Rn |-id=Франциум-204 | rowspan=2|204Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 117 | rowspan=2|204,000652(26) | rowspan=2|1,7(3) с | α (96%) | 200At | rowspan=2|(3+) | rowspan=2| |- | β+ (4%) | 204Rn |-id=Франциум-204m1 | rowspan=2 style="text-indent:1em" | 204m1Fr | rowspan=2| | rowspan=2 colspan="3" style="text-indent:2em" | 50(4) keV | rowspan=2|2,6(3) с | α (90%) | 200At | rowspan=2|(7+) | rowspan=2| |- | β+ (10%) | 204Rn |-id=Франциум-204m2 | style="text-indent:1em" | 204m2Fr | | colspan="3" style="text-indent:2em" | 326(4) keV | 1,7(6) с
| (10−)
|-id=Франциум-205 | rowspan=2|205Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 118 | rowspan=2|204,998594(8) | rowspan=2|3,80(3) с | α (99%) | 201At | rowspan=2|(9/2−) | rowspan=2| |- | β+ (1%) | 205Rn |-id=Франциум-206 | rowspan=2|206Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 119 | rowspan=2|205,998661(30) | rowspan=2|~16 с | β+ (58%) | 206Rn | rowspan=2|(2+, 3+) | rowspan=2| |- | α (42%) | 202At |-id=Франциум-206m1 | style="text-indent:1em" | 206m1Fr | | colspan="3" style="text-indent:2em" | 190(40) keV | 15,9(1) с
| (7+) | |-id=Франциум-206m2 | style="text-indent:1em" | 206m2Fr | | colspan="3" style="text-indent:2em" | 730(40) keV | 700(100) мс
| (10−) | |-id=Франциум-207 | rowspan=2|207Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 120 | rowspan=2|206,996941(19) | rowspan=2|14,8(1) с | α (95%) | 203At | rowspan=2|9/2− | rowspan=2| |- | β+ (5%) | 207Rn |-id=Франциум-208 | rowspan=2|208Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 121 | rowspan=2|207,997139(13) | rowspan=2|59,1(3) с | α (90%) | 204At | rowspan=2|7+ | rowspan=2| |- | β+ (10%) | 208Rn |-id=Франциум-209 | rowspan=2|209Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 122 | rowspan=2|208,995940(12) | rowspan=2|50,0(3) с | α (89%) | 205At | rowspan=2|9/2− | rowspan=2| |- | β+ (11%) | 209Rn |-id=Франциум-210 | rowspan=2|210Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 123 | rowspan=2|209,996411(14) | rowspan=2|3,18(6) мин | α (60%) | 206At | rowspan=2|6+ | rowspan=2| |- | β+ (40%) | 210Rn |-id=Франциум-211 | rowspan=2|211Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 124 | rowspan=2|210,995555(13) | rowspan=2|3,10(2) мин | α (80%) | 207At | rowspan=2|9/2− | rowspan=2| |- | β+ (20%) | 211Rn |-id=Франциум-212 | rowspan=2|212Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 125 | rowspan=2|211,996225(9) | rowspan=2|20,0(6) мин | β+ (57%) | 212Rn | rowspan=2|5+ | rowspan=2| |- | α (43%) | 208At |-id=Франциум-213 | rowspan=2|213Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 126 | rowspan=2|212,996184(5) | rowspan=2|34,14(6) с | α (99,45%) | 209At | rowspan=2|9/2− | rowspan=2| |- | β+ (,55%) | 213Rn |-id=Франциум-214 | 214Fr | | style="text-align:right" | 87 | style="text-align:right" | 127 | 213,998971(9) | 5,0(2) мс | α | 210At | (1−) | |-id=Франциум-214m1 | style="text-indent:1em" | 214m1Fr | | colspan="3" style="text-indent:2em" | 123(6) keV | 3,35(5) мс | α | 210At | (8−) | |-id=Франциум-214m2 | style="text-indent:1em" | 214m2Fr | | colspan="3" style="text-indent:2em" | 638(6) keV | 103(4) нс
| (11+) | |-id=Франциум-214m3 | style="text-indent:1em" | 214m3Fr | | colspan="3" style="text-indent:2em" | 6477+Y keV | 108(7) нс
| (33+) | |-id=Франциум-215 | 215Fr | | style="text-align:right" | 87 | style="text-align:right" | 128 | 215,000342(8) | 86(5) нс | α | 211At | 9/2− | |-id=Франциум-216 |216Fr | | style="text-align:right" | 87 | style="text-align:right" | 129 |216,003190(4) |0,70(2) μс | α | 212At |(1−) | |-id=Франциум-216m | style="text-indent:1em" | 216mFr | | colspan="3" style="text-indent:2em" | 219(6) keV | 850(30) нс | α | 212At | (9−) | |-id=Франциум-217 | 217Fr | | style="text-align:right" | 87 | style="text-align:right" | 130 | 217,004632(7) | 16,8(19) μс | α | 213At | 9/2− | |-id=Франциум-218 | 218Fr | | style="text-align:right" | 87 | style="text-align:right" | 131 | 218,007579(5) | 1,0(6) мс | α | 214At | 1− | |-id=Франциум-218m1 |style="text-indent:1em" | 218m1Fr | | colspan="3" style="text-indent:2em" | 86(4) keV | 22,0(5) мс | α | 214At | (8−) | |-id=Франциум-218m2 | style="text-indent:1em" | 218m2Fr | | colspan="3" style="text-indent:2em" | 200(150)# keV
| high | |-id=Франциум-219 | 219Fr | | style="text-align:right" | 87 | style="text-align:right" | 132 | 219,009251(7) | 20(2) мс | α | 215At | 9/2− | |-id=Франциум-220 | rowspan=2|220Fr | rowspan=2| | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 133 | rowspan=2|220,012327(4) | rowspan=2|27,4(3) с | α (99,65%) | 216At | rowspan=2|1+ | rowspan=2| |- | β− (,35%) | 220Ra |-id=Франциум-221 | rowspan=3|221Fr | rowspan=3| | rowspan=3 style="text-align:right" | 87 | rowspan=3 style="text-align:right" | 134 | rowspan=3|221,014254(5) | rowspan=3|4,801(5) мин | α (99,9%) | 217At | rowspan=3|5/2− | rowspan=3|ТрагиРаспаден меѓупроизвод на 237Np |- | β− (,1%) | 221Ra |- | CD (8,79×10−11%)Познато е дека нуклидот со најмал атомски број е подложен на гроздест распад | 207Tl14C |-id=Франциум-222 | 222Fr | | style="text-align:right" | 87 | style="text-align:right" | 135 | 222,017583(8) | 14,2(3) мин | β− | 222Ra | 2− | |-id=Франциум-223 | rowspan=2|223Fr | rowspan=2|Актиниум K | rowspan=2 style="text-align:right" | 87 | rowspan=2 style="text-align:right" | 136 | rowspan=2|223,0197342(21) | rowspan=2|22,00(7) мин | β− (99,99%) | 223Ra | rowspan=2|3/2(−) | rowspan=2|Трагираспаден меѓупроизвод од 235U |- | α (,006%) | 219At |-id=Франциум-224 | 224Fr | | style="text-align:right" | 87 | style="text-align:right" | 137 | 224,023348(12) | 3,33(10) мин | β− | 224Ra | 1− | |-id=Франциум-225 | 225Fr | | style="text-align:right" | 87 | style="text-align:right" | 138 | 225,025572(13) | 4,0(2) мин | β− | 225Ra | 3/2− | |-id=Франциум-226 | 226Fr | | style="text-align:right" | 87 | style="text-align:right" | 139 | 226,029545(7) | 49(1) с | β− | 226Ra | 1− | |-id=Франциум-227 | 227Fr | | style="text-align:right" | 87 | style="text-align:right" | 140 | 227,031865(6) | 2,47(3) мин | β− | 227Ra | 1/2+ | |-id=Франциум-228 | 228Fr | | style="text-align:right" | 87 | style="text-align:right" | 141 | 228,035839(7) | 38(1) с | β− | 228Ra | 2− | |-id=Франциум-229 | 229Fr | | style="text-align:right" | 87 | style="text-align:right" | 142 | 229,038291(5) | 50,2(4) с | β− | 229Ra | (1/2+)# | |-id=Франциум-230 | 230Fr | | style="text-align:right" | 87 | style="text-align:right" | 143 | 230,042391(7) | 19,1(5) с | β− | 230Ra
|-id=Франциум-231 | 231Fr | | style="text-align:right" | 87 | style="text-align:right" | 144 | 231,045175(8) | 17,6(6) с | β− | 231Ra | (1/2+)# | |-id=Франциум-232 | 232Fr | | style="text-align:right" | 87 | style="text-align:right" | 145 | 232,049461(15) | 5(1) с | β− | 232Ra
|-id=Франциум-233 | 233Fr | | style="text-align:right" | 87 | style="text-align:right" | 146 | 233,052518(21) | 900(100) мс | β− | 233Ra | 1/2+ # |
Наводи
Half-life, spin, and isomer data selected from the following sources.
Франциум Категорија:Изотопи на франциумот Категорија:Франциум