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Isotopes of francium#Francium-211

{{Short description|none}}

{{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

{{Anchor|Francium-198m|Francium-199m1|Francium-199m2|Francium-200m1|Francium-200m2|Francium-201m1|Francium-201m2|Francium-203m1|Francium-203m2|Francium-205m1|Francium-205m2|Francium-208m|Francium-209m|Francium-210m|Francium-211m1|Francium-211m2|Francium-212m1|Francium-212m2|Francium-212m3|Francium-212m4|Francium-213m1|Francium-213m2|Francium-213m3|Francium-218m|Francium-228m}}

{{Isotopes table

|symbol=Fr

|refs=AME2020 II

|notes=m, histname, unc(), mass#, exen#, hl#, spin(), spin#, IT, CD

}}

|-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{{cite journal | last1=Fisichella | first1=M. | last2=Musumarra | first2=A. | last3=Farinon | first3=F. | last4=Nociforo | first4=C. | last5=Del Zoppo | first5=A. | last6=Figuera | first6=P. | last7=La Cognata | first7=M. | last8=Pellegriti | first8=M. G. | last9=Scuderi | first9=V. | last10=Torresi | first10=D. | last11=Strano | first11=E. | title=Determination of the half-life of 213Fr with high precision | journal=Physical Review C | publisher=American Physical Society (APS) | volume=88 | issue=1 | date=2013-07-24 | page=011303 | issn=0556-2813 | doi=10.1103/physrevc.88.011303| bibcode=2013PhRvC..88a1303F }}

| 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

| α{{refn|group=n|Theoretically capable of β+ decay to 216Rn{{NUBASE2020|ref}}}}

| 212m1At{{cite web|url=https://www.nndc.bnl.gov/ensnds/212/At/a_decay_850_ns.pdf|title=216At α decay (850 ns)|publisher=NNDC Chart of Nuclides}}

| (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|TraceIntermediate decay product of 237Np

|-

| β− (.1%)

| 221Ra

|-

| CD (8.79×10−11%)The nuclide with the lowest atomic number known to undergo cluster decay

| 207Tl
14C

|-id=Francium-222

| 222Fr

|

| style="text-align:right" | 87

| style="text-align:right" | 135

| 222.017583(8)

| 14.2(3) min

| β−{{refn|group=n|Theoretically capable of α decay to 218At with a partial half-life of ~1 d (branching ratio ~1%).{{Citation |last1=Hyde |first1=E. K. |last2=Ghiorso |first2=A. |title=Preparation of a New Isotope of Francium - Fr222 |date=4 February 1950 |url=https://escholarship.org/uc/item/6xx699r2 |location=California Univ., Berkeley (USA) |publisher=Radiation Laboratory}}}}

| 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|TraceIntermediate decay product of 235U

|-

| 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+ #

|

{{Isotopes table/footer}}

References

{{Reflist}}

  • Half-life, spin, and isomer data selected from the following sources.
  • {{NUBASE 2003}}
  • {{NNDC}}
  • {{CRC85|chapter=11}}

{{Navbox element isotopes}}

Francium