Isotopes of francium

Template:Short description Template:Infobox francium isotopes Francium (₈₇Fr) has no stable isotopes, thus 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.

List of isotopes

Template:Isotopes table |-id=Francium-197 | ¹⁹⁷Fr | | style="text-align:right" | 87 | style="text-align:right" | 110 | 197.01101(6) | 2.3(19) ms | α | ¹⁹³At | (7/2−) | |-id=Francium-198 | ¹⁹⁸Fr | | style="text-align:right" | 87 | style="text-align:right" | 111 | 198.01028(3) | 15(3) ms | α | ¹⁹⁴At | 3+# | |-id=Francium-199 | ¹⁹⁹Fr | | style="text-align:right" | 87 | style="text-align:right" | 112 | 199.007269(15) | 16(7) ms | α | ¹⁹⁵At | 1/2+# | |-id=Francium-200 | ²⁰⁰Fr | | style="text-align:right" | 87 | style="text-align:right" | 113 | 200.00658(3) | 24(10) ms | α | ¹⁹⁶At | 3+# | |-id=Francium-200m | style="text-indent:1em" | ^200mFr | | colspan="3" style="text-indent:2em" | 60(110) keV | 190(120) ms | α | ¹⁹⁶At | 10−# | |-id=Francium-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) ms | α (99%) | ¹⁹⁷At | rowspan=2|(9/2−) | rowspan=2| |- | β⁺ (1%) | ²⁰¹Rn |-id=Francium-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) ms | α (97%) | ¹⁹⁸At | rowspan=2|(3+) | rowspan=2| |- | β⁺ (3%) | ²⁰²Rn |-id=Francium-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) ms | α (97%) | ¹⁹⁸At | rowspan=2|(10−) | rowspan=2| |- | β⁺ (3%) | ²⁰²Rn |-id=Francium-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) s | α (95%) | ¹⁹⁹At | rowspan=2|(9/2−)# | rowspan=2| |- | β⁺ (5%) | ²⁰³Rn |-id=Francium-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) s | α (96%) | ²⁰⁰At | rowspan=2|(3+) | rowspan=2| |- | β⁺ (4%) | ²⁰⁴Rn |-id=Francium-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) s | α (90%) | ²⁰⁰At | rowspan=2|(7+) | rowspan=2| |- | β⁺ (10%) | ²⁰⁴Rn |-id=Francium-204m2 | style="text-indent:1em" | ^204m2Fr | | colspan="3" style="text-indent:2em" | 326(4) keV | 1.7(6) s | | | (10−) | |-id=Francium-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) s | α (99%) | ²⁰¹At | rowspan=2|(9/2−) | rowspan=2| |- | β⁺ (1%) | ²⁰⁵Rn |-id=Francium-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 s | β⁺ (58%) | ²⁰⁶Rn | rowspan=2|(2+, 3+) | rowspan=2| |- | α (42%) | ²⁰²At |-id=Francium-206m1 | style="text-indent:1em" | ^206m1Fr | | colspan="3" style="text-indent:2em" | 190(40) keV | 15.9(1) s | | | (7+) | |-id=Francium-206m2 | style="text-indent:1em" | ^206m2Fr | | colspan="3" style="text-indent:2em" | 730(40) keV | 700(100) ms | | | (10−) | |-id=Francium-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) s | α (95%) | ²⁰³At | rowspan=2|9/2− | rowspan=2| |- | β⁺ (5%) | ²⁰⁷Rn |-id=Francium-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) s | α (90%) | ²⁰⁴At | rowspan=2|7+ | rowspan=2| |- | β⁺ (10%) | ²⁰⁸Rn |-id=Francium-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) s | α (89%) | ²⁰⁵At | rowspan=2|9/2− | rowspan=2| |- | β⁺ (11%) | ²⁰⁹Rn |-id=Francium-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) min | α (60%) | ²⁰⁶At | rowspan=2|6+ | rowspan=2| |- | β⁺ (40%) | ²¹⁰Rn |-id=Francium-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) min | α (80%) | ²⁰⁷At | rowspan=2|9/2− | rowspan=2| |- | β⁺ (20%) | ²¹¹Rn |-id=Francium-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) min | β⁺ (57%) | ²¹²Rn | rowspan=2|5+ | rowspan=2| |- | α (43%) | ²⁰⁸At |-id=Francium-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) s | α (99.45%) | ²⁰⁹At | rowspan=2|9/2− | rowspan=2| |- | β⁺ (.55%) | ²¹³Rn |-id=Francium-214 | ²¹⁴Fr | | style="text-align:right" | 87 | style="text-align:right" | 127 | 213.998971(9) | 5.0(2) ms | α | ²¹⁰At | (1−) | |-id=Francium-214m1 | style="text-indent:1em" | ^214m1Fr | | colspan="3" style="text-indent:2em" | 123(6) keV | 3.35(5) ms | α | ²¹⁰At | (8−) | |-id=Francium-214m2 | style="text-indent:1em" | ^214m2Fr | | colspan="3" style="text-indent:2em" | 638(6) keV | 103(4) ns | | | (11+) | |-id=Francium-214m3 | style="text-indent:1em" | ^214m3Fr | | colspan="3" style="text-indent:2em" | 6477+Y keV | 108(7) ns | | | (33+) | |-id=Francium-215 | ²¹⁵Fr | | style="text-align:right" | 87 | style="text-align:right" | 128 | 215.000342(8) | 86(5) ns | α | ²¹¹At | 9/2− | |-id=Francium-216 |²¹⁶Fr | | style="text-align:right" | 87 | style="text-align:right" | 129 |216.003190(4) |0.70(2) μs | α | ²¹²At |(1−) | |-id=Francium-216m | style="text-indent:1em" | ^216mFr | | colspan="3" style="text-indent:2em" | 219(6) keV | 850(30) ns | αTemplate:Refn | ^212m1At | (9−) | |-id=Francium-217 | ²¹⁷Fr | | style="text-align:right" | 87 | style="text-align:right" | 130 | 217.004632(7) | 16.8(19) μs | α | ²¹³At | 9/2− | |-id=Francium-218 | ²¹⁸Fr | | style="text-align:right" | 87 | style="text-align:right" | 131 | 218.007579(5) | 1.0(6) ms | α | ²¹⁴At | 1− | |-id=Francium-218m1 |style="text-indent:1em" | ^218m1Fr | | colspan="3" style="text-indent:2em" | 86(4) keV | 22.0(5) ms | α | ²¹⁴At | (8−) | |-id=Francium-218m2 | style="text-indent:1em" | ^218m2Fr | | colspan="3" style="text-indent:2em" | 200(150)# keV | | | | high | |-id=Francium-219 | ²¹⁹Fr | | style="text-align:right" | 87 | style="text-align:right" | 132 | 219.009251(7) | 20(2) ms | α | ²¹⁵At | 9/2− | |-id=Francium-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) s | α (99.65%) | ²¹⁶At | rowspan=2|1+ | rowspan=2| |- | β⁻ (.35%) | ²²⁰Ra |-id=Francium-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) min | α (99.9%) | ²¹⁷At | rowspan=3|5/2− | rowspan=3|Trace |- | β⁻ (.1%) | ²²¹Ra |- | CD (8.79×10⁻¹¹%) | ²⁰⁷Tl
¹⁴C |-id=Francium-222 | ²²²Fr | | style="text-align:right" | 87 | style="text-align:right" | 135 | 222.017583(8) | 14.2(3) min | β⁻Template:Refn | ²²²Ra | 2− | |-id=Francium-223 | rowspan=2|²²³Fr | rowspan=2|Actinium 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) min | β⁻ (99.99%) | ²²³Ra | rowspan=2|3/2(−) | rowspan=2|Trace |- | α (.006%) | ²¹⁹At |-id=Francium-224 | ²²⁴Fr | | style="text-align:right" | 87 | style="text-align:right" | 137 | 224.023348(12) | 3.33(10) min | β⁻ | ²²⁴Ra | 1− | |-id=Francium-225 | ²²⁵Fr | | style="text-align:right" | 87 | style="text-align:right" | 138 | 225.025572(13) | 4.0(2) min | β⁻ | ²²⁵Ra | 3/2− | |-id=Francium-226 | ²²⁶Fr | | style="text-align:right" | 87 | style="text-align:right" | 139 | 226.029545(7) | 49(1) s | β⁻ | ²²⁶Ra | 1− | |-id=Francium-227 | ²²⁷Fr | | style="text-align:right" | 87 | style="text-align:right" | 140 | 227.031865(6) | 2.47(3) min | β⁻ | ²²⁷Ra | 1/2+ | |-id=Francium-228 | ²²⁸Fr | | style="text-align:right" | 87 | style="text-align:right" | 141 | 228.035839(7) | 38(1) s | β⁻ | ²²⁸Ra | 2− | |-id=Francium-229 | ²²⁹Fr | | style="text-align:right" | 87 | style="text-align:right" | 142 | 229.038291(5) | 50.2(4) s | β⁻ | ²²⁹Ra | (1/2+)# | |-id=Francium-230 | ²³⁰Fr | | style="text-align:right" | 87 | style="text-align:right" | 143 | 230.042391(7) | 19.1(5) s | β⁻ | ²³⁰Ra | | |-id=Francium-231 | ²³¹Fr | | style="text-align:right" | 87 | style="text-align:right" | 144 | 231.045175(8) | 17.6(6) s | β⁻ | ²³¹Ra | (1/2+)# | |-id=Francium-232 | ²³²Fr | | style="text-align:right" | 87 | style="text-align:right" | 145 | 232.049461(15) | 5(1) s | β⁻ | ²³²Ra | | |-id=Francium-233 | ²³³Fr | | style="text-align:right" | 87 | style="text-align:right" | 146 | 233.052518(21) | 900(100) ms | β⁻ | ²³³Ra | 1/2+ # | Template:Isotopes table/footer

References

• Half-life, spin, and isomer data selected from the following sources.
  • Template:NUBASE 2003
  • Template:NNDC
  • Template:CRC85