isotopes of radon

There are 39 known isotopes of radon (₈₆Rn), from ¹⁹³Rn to ²³¹Rn; all are radioactive. The most stable isotope is ²²²Rn with a half-life of 3.8235 days, which decays into {{SimpleNuclide|Polonium|218|link=yes}}. Six isotopes of radon, ^{217, 218, 219, 220, 221, 222}Rn, occur in trace quantities in nature as decay products of, respectively, ²¹⁷At, ²¹⁸At, ²²³Ra, ²²⁴Ra, ²²⁵Ra, and ²²⁶Ra. ²¹⁷Rn and ²²¹Rn are produced in rare branches in the decay chain of trace quantities of ²³⁷Np; ²²²Rn (and also ²¹⁸Rn in a rare branch) is an intermediate step in the decay chain of ²³⁸U;{{cite web | url=https://www-nds.iaea.org/relnsd/vcharthtml/decaychain.html#NUCID=238U | title=Decay Chain }} ²¹⁹Rn is an intermediate step in the decay chain of ²³⁵U; and ²²⁰Rn occurs in the decay chain of ²³²Th.

List of isotopes

{{Isotopes table

| symbol = Rn

| refs = AME2020 II

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

}}

|-id=Radon-193

| ¹⁹³Rn

| style="text-align:right" | 86

| style="text-align:right" | 107

| 193.009708(27)

| 1.15(27) ms

| α

| ¹⁸⁹Po

| (3/2−)

|-id=Radon-194

| rowspan=2|¹⁹⁴Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 108

| rowspan=2|194.006146(18)

| rowspan=2|0.78(16) ms

| α

| ¹⁹⁰Po

| rowspan=2|0+

| rowspan=2|

| β⁺?

| ¹⁹⁴At

|-id=Radon-195

| ¹⁹⁵Rn

| style="text-align:right" | 86

| style="text-align:right" | 109

| 195.005422(55)

| 7(3) ms

| α

| ¹⁹¹Po

| 3/2−

|-id=Radon-195m

| style="text-indent:1em" | ^195mRnOrder of ground state and isomer is uncertain.

| colspan="3" style="text-indent:2em" | 80(50) keV

| 6(3) ms

| α

| ¹⁹¹Po

| 13/2+

|-id=Radon-196

| rowspan=2|¹⁹⁶Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 110

| rowspan=2|196.002120(15)

| rowspan=2|4.7(11) ms

| α

| ¹⁹²Po

| rowspan=2|0+

| rowspan=2|

| β⁺?

| ¹⁹⁶At

|-id=Radon-197

| rowspan=2|¹⁹⁷Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 111

| rowspan=2|197.001621(17)

| rowspan=2|54(6) ms

| α

| ¹⁹³Po

| rowspan=2|3/2−

| rowspan=2|

| β⁺?

| ¹⁹⁷At

|-id=Radon-197m

| rowspan=2 style="text-indent:1em" | ^197mRn

| rowspan=2|

| rowspan=2 colspan="3" style="text-indent:2em" | 199(11) keV

| rowspan=2|25.6(25) ms

| α

| ¹⁹³Po

| rowspan=2|13/2+

| rowspan=2|

| β⁺?

| ¹⁹⁷At

|-id=Radon-198

| rowspan=2|¹⁹⁸Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 112

| rowspan=2|197.998679(14)

| rowspan=2|64.4(16) ms

| α (93%)

| ¹⁹⁴Po

| rowspan=2|0+

| rowspan=2|

| β⁺? (7%)

| ¹⁹⁸At

|-id=Radon-199

| rowspan=2|¹⁹⁹Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 113

| rowspan=2|198.9983254(78)

| rowspan=2|590(30) ms

| α

| ¹⁹⁵Po

| rowspan=2|3/2−

| rowspan=2|

| β⁺?

| ¹⁹⁹At

|-id=Radon-199m

| rowspan=3 style="text-indent:1em" | ^199mRn

| rowspan=3|

| rowspan=3 colspan="3" style="text-indent:2em" | 220(11) keV

| rowspan=3|310(20) ms

| α

| ¹⁹⁵Po

| rowspan=3|13/2+

| rowspan=3|

| β⁺?

| ¹⁹⁹At

| IT?

| ¹⁹⁹Rn

|-id=Radon-200

| rowspan=2|²⁰⁰Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 114

| rowspan=2|199.9957053(62)

| rowspan=2|1.09(16) s

| α (92%)

| ¹⁹⁶Po

| rowspan=2|0+

| rowspan=2|

| β⁺? (8%)

| ²⁰⁰At

|-id=Radon-200m

| style="text-indent:1em" | ^200mRn

| colspan="3" style="text-indent:2em" | 2320(20)# keV

| 28(9) μs

| IT

| ²⁰⁰Rn

|-id=Radon-201

| rowspan=2|²⁰¹Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 115

| rowspan=2|200.995591(11)

| rowspan=2|7.0(4) s

| α

| ¹⁹⁷Po

| rowspan=2|3/2−

| rowspan=2|

| β⁺?

| ²⁰¹At

|-id=Radon-201m

| rowspan=2 style="text-indent:1em" | ^201mRn

| rowspan=2|

| rowspan=2 colspan="3" style="text-indent:2em" | 245(12) keV

| rowspan=2|3.8(1) s

| α

| ¹⁹⁷Po

| rowspan=2|13/2+

| rowspan=2|

| β⁺?

| ²⁰¹At

|-id=Radon-202

| rowspan=2|²⁰²Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 116

| rowspan=2|201.993264(19)

| rowspan=2|9.7(1) s

| α (78%)

| ¹⁹⁸Po

| rowspan=2|0+

| rowspan=2|

| β⁺ (22%)

| ²⁰²At

|-id=Radon-202m

| style="text-indent:1em" | ^202mRn

| colspan="3" style="text-indent:2em" | 2310(50)# keV

| 2.22(7) μs

| IT

| ²⁰²Rn

| 11−#

|-id=Radon-203

| rowspan=2|²⁰³Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 117

| rowspan=2|202.9933612(62)

| rowspan=2|44.2(16) s

| α (66%)

| ¹⁹⁹Po

| rowspan=2|3/2−

| rowspan=2|

| β⁺ (34%)

| ²⁰³At

|-id=Radon-203m

| rowspan=2 style="text-indent:1em" | ^203mRn

| rowspan=2|

| rowspan=2 colspan="3" style="text-indent:2em" | 362(4) keV

| rowspan=2|26.9(5) s

| α (75%)

| ¹⁹⁹Po

| rowspan=2|13/2+

| rowspan=2|

| β⁺ (25%)

| ²⁰³At

|-id=Radon-204

| rowspan=2|²⁰⁴Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 118

| rowspan=2|203.9914437(80)

| rowspan=2|1.242(23) min

| α (72.4%)

| ²⁰⁰Po

| rowspan=2|0+

| rowspan=2|

| β⁺ (27.6%)

| ²⁰⁴At

|-id=Radon-205

| rowspan=2|²⁰⁵Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 119

| rowspan=2|204.9917232(55)

| rowspan=2|170(4) s

| β⁺ (75.4%)

| ²⁰⁵At

| rowspan=2|5/2−

| rowspan=2|

| α (24.6%)

| ²⁰¹Po

|-id=Radon-205m

| rowspan=3 style="text-indent:1em" | ^205mRn

| rowspan=3|

| rowspan=3 colspan="3" style="text-indent:2em" | 657.1(5) keV

| rowspan=3|>10 s

| IT

| ²⁰⁵Rn

| rowspan=3|13/2+#

| rowspan=3|

| α?

| ²⁰¹Po

| β⁺?

| ²⁰⁵At

|-id=Radon-206

| rowspan=2|²⁰⁶Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 120

| rowspan=2|205.9901954(92)

| rowspan=2|5.67(17) min

| α (62%)

| ²⁰²Po

| rowspan=2|0+

| rowspan=2|

| β⁺ (38%)

| ²⁰⁶At

|-id=Radon-207

| rowspan=2|²⁰⁷Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 121

| rowspan=2|206.9907302(51)

| rowspan=2|9.25(17) min

| β⁺ (79%)

| ²⁰⁷At

| rowspan=2|5/2−

| rowspan=2|

| α (21%)

| ²⁰³Po

|-id=Radon-207m

| style="text-indent:1em" | ^207mRn

| colspan="3" style="text-indent:2em" | 899.1(10) keV

| 184.5(9) μs

| IT

| ²⁰⁷Rn

| 13/2+

|-id=Radon-208

| rowspan=2|²⁰⁸Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 122

| rowspan=2|207.989635(11)

| rowspan=2|24.35(14) min

| α (62%)

| ²⁰⁴Po

| rowspan=2|0+

| rowspan=2|

| β⁺ (38%)

| ²⁰⁸At

|-id=Radon-208m

| style="text-indent:1em" | ^208mRn

| colspan="3" style="text-indent:2em" | 1828.3(4) keV

| 487(12) ns

| IT

| ²⁰⁸Rn

| 8+

|-id=Radon-209

| rowspan=2|²⁰⁹Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 123

| rowspan=2|208.990401(11)

| rowspan=2|28.8(10) min

| β⁺ (83%)

| ²⁰⁹At

| rowspan=2|5/2−

| rowspan=2|

| α (17%)

| ²⁰⁵Po

|-id=Radon-209m1

| style="text-indent:1em" | ^209m1Rn

| colspan="3" style="text-indent:2em" | 1174.01(13) keV

| 13.4(13) μs

| IT

| ²⁰⁹Rn

| 13/2+

|-id=Radon-209m2

| style="text-indent:1em" | ^209m2Rn

| colspan="3" style="text-indent:2em" | 3636.81(23) keV

| 3.0(3) μs

| IT

| ²⁰⁹Rn

| 35/2+

|-id=Radon-210

| rowspan=2|²¹⁰Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 124

| rowspan=2|209.9896889(49)

| rowspan=2|2.4(1) h

| α (96%)

| ²⁰⁶Po

| rowspan=2|0+

| rowspan=2|

| β⁺ (4%)

| ²¹⁰At

|-id=Radon-210m1

| style="text-indent:1em" | ^210m1Rn

| colspan="3" style="text-indent:2em" | 1710(30) keV

| 644(40) ns

| IT

| ²¹⁰Rn

| 8+

|-id=Radon-210m2

| style="text-indent:1em" | ^210m2Rn

| colspan="3" style="text-indent:2em" | 3857(30) keV

| 1.06(5) μs

| IT

| ²¹⁰Rn

| 17−

|-id=Radon-210m3

| style="text-indent:1em" | ^210m3Rn

| colspan="3" style="text-indent:2em" | 6514(30) keV

| 1.04(7) μs

| IT

| ²¹⁰Rn

| 23+

|-id=Radon-211

| rowspan=2|²¹¹Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 125

| rowspan=2|210.9906008(73)

| rowspan=2|14.6(2) h

| β⁺ (72.6%)

| ²¹¹At

| rowspan=2|1/2−

| rowspan=2|

| α (27.4%)

| ²⁰⁷Po

|-id=Radon-211m1

| style="text-indent:1em" | ^211m1Rn

| colspan="3" style="text-indent:2em" | 1603(14)# keV

| 596(28) ns

| IT

| ²¹¹Rn

| 17/2−

|-id=Radon-211m2

| style="text-indent:1em" | ^211m2Rn

| colspan="3" style="text-indent:2em" | 8905(20)# keV

| 201(4) ns

| IT

| ²¹¹Rn

| 63/2−

|-id=Radon-212

|²¹²Rn

|style="text-align:right" | 86

|style="text-align:right" | 126

|211.9907039(33)

|23.9(12) min

| α

| ²⁰⁸Po

|0+

|-id=Radon-212m1

| style="text-indent:1em" | ^212m1Rn

| colspan="3" style="text-indent:2em" | 1639.68(15) keV

| 118(14) ns

| IT

| ²¹²Rn

| 6+

|-id=Radon-212m2

| style="text-indent:1em" | ^212m2Rn

| colspan="3" style="text-indent:2em" | 1694.1(3) keV

| 910(30) ns

| IT

| ²¹²Rn

| 8+

|-id=Radon-212m3

| style="text-indent:1em" | ^212m3Rn

| colspan="3" style="text-indent:2em" | 6174.2(3) keV

| 102(4) ns

| IT

| ²¹²Rn

| 22+

|-id=Radon-212m4

| style="text-indent:1em" | ^212m4Rn

| colspan="3" style="text-indent:2em" | 8579.2(4) keV

| 154(14) ns

| IT

| ²¹²Rn

| 30+

|-id=Radon-213

| ²¹³Rn

| style="text-align:right" | 86

| style="text-align:right" | 127

| 212.9938851(36)

| 19.5(1) ms

| α{{refn|group=n|Theoretically capable of electron capture to ²¹³At{{cite web|url=https://www.nndc.bnl.gov/ensnds/213/Rn/adopted.pdf|title=Adopted Levels for ²¹³Rn|publisher=NNDC Chart of Nuclides}}}}

| ²⁰⁹Po

| 9/2+#

|-id=Radon-213m1

| style="text-indent:1em" | ^213m1Rn

| colspan="3" style="text-indent:2em" | 1682(10) keV

| 1.00(21) μs

| IT

| ²¹³Rn

| (25/2+)

|-id=Radon-213m2

| style="text-indent:1em" | ^213m2Rn

| colspan="3" style="text-indent:2em" | 2205(10) keV

| 1.36(7) μs

| IT

| ²¹³Rn

| (31/2−)

|-id=Radon-213m3

| style="text-indent:1em" | ^213m3Rn

| colspan="3" style="text-indent:2em" | 5965(14) keV

| 164(11) ns

| IT

| ²¹³Rn

| (55/2+)

|-id=Radon-214

|²¹⁴Rn

| style="text-align:right" | 86

|style="text-align:right" | 128

|213.9953627(99)

|259(3) ns

| α

| ²¹⁰Po

|0+

|-id=Radon-214m

| style="text-indent:1em" | ^214mRn

| colspan="3" style="text-indent:2em" | 4595.4(18) keV

| 245(30) ns

|IT

|²¹⁴Rn

| (22+)

|-id=Radon-215

| ²¹⁵Rn

| style="text-align:right" | 86

| style="text-align:right" | 129

| 214.9987450(65)

| 2.30(10) μs

| α

| ²¹¹Po

| 9/2+

|-id=Radon-216

| ²¹⁶Rn

| style="text-align:right" | 86

| style="text-align:right" | 130

| 216.0002719(62)

| 29(4) μs

| α

| ²¹²Po

| 0+

|-id=Radon-217

| ²¹⁷Rn

| style="text-align:right" | 86

| style="text-align:right" | 131

| 217.0039276(45)

| 593(38) μs

| α

| ²¹³Po

| 9/2+

| TraceIntermediate decay product of ²³⁷Np

|-id=Radon-218

| ²¹⁸Rn

| style="text-align:right" | 86

| style="text-align:right" | 132

| 218.0056011(25)

| 33.75(15) ms

| α

| ²¹⁴Po

| 0+

| TraceIntermediate decay product of ²³⁸U

|-id=Radon-219

| ²¹⁹RnTheoretically capable of β⁻ decay to ²¹⁹Fr

| Actinon
Actinium emanation

| style="text-align:right" | 86

| style="text-align:right" | 133

| 219.0094787(23)

| 3.96(1) s

| α

| ²¹⁵Po

| 5/2+

| TraceIntermediate decay product of ²³⁵U

|-id=Radon-220

|²²⁰Rn

|Thoron
Thorium emanation

| style="text-align:right" | 86

| style="text-align:right" | 134

| 220.0113924(19)

|55.6(1) s

| αTheoretically capable of β⁻β⁻ decay to ²²⁰Ra

| ²¹⁶Po

|0+

|TraceIntermediate decay product of ²³²Th

|-id=Radon-221

| rowspan=2|²²¹Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 135

| rowspan=2|221.0155356(61)

| rowspan=2|25.7(5) min

| β⁻ (78%)

| ²²¹Fr

| rowspan=2|7/2+

| rowspan=2|Trace

| α (22%)

| ²¹⁷Po

| ²²²RnMost common isotope

| RadonSource of element's name
Radium emanation
Emanation
Emanon
Niton

| style="text-align:right" | 86

| style="text-align:right" | 136

| 222.0175760(21)

| 3.8215(2) d

| α{{refn|group=n|Theoretically capable of β⁻β⁻ decay to ²²²Ra and perhaps β⁻ decay to ²²²Fr{{cite journal |last1=Belli |first1=P. |last2=Bernabei |first2=R. |last3=Cappella |first3=C. |last4=Caracciolo |first4=V. |last5=Cerulli |first5=R. |last6=Danevich |first6=F.A. |last7=Di Marco |first7=A. |last8=Incicchitti |first8=A. |last9=Poda |first9=D.V. |last10=Polischuk |first10=O.G. |last11=Tretyak |first11=V.I. |title=Investigation of rare nuclear decays with BaF₂ crystal scintillator contaminated by radium |date=2014 |journal=European Physical Journal A |volume=50 |issue=9 |pages=134–143 |doi=10.1140/epja/i2014-14134-6 |arxiv=1407.5844|bibcode=2014EPJA...50..134B |s2cid=118513731 }}}}

| ²¹⁸Po

| 0+

| Trace

|-id=Radon-223

| rowspan=2|²²³Rn

| rowspan=2|

| rowspan=2 style="text-align:right" | 86

| rowspan=2 style="text-align:right" | 137

| rowspan=2|223.0218893(84)

| rowspan=2|24.3(4) min

| β⁻

| ²²³Fr

| rowspan=2|7/2+

| rowspan=2|

| α?{{refn|group=n|Theoretically capable of α decay with a partial half-life of ~3.65×10⁸ seconds (~11.6 years; branching ratio ~4×10⁻⁴%).{{cite journal|last1=Sun |first1=Xiao-Dong |last2=Duan |first2=Chao |last3=Deng |first3=Jun-Gang |last4=Guo |first4=Ping |last5=Li |first5 = Xiao-Hua |title=Systematic study of α decay for odd-A nuclei within a two-potential approach |journal = Physical Review C | volume=95 | issue=1 | date=2017-01-18 | page=014319 |url=https://journals.aps.org/prc/abstract/10.1103/PhysRevC.95.014319 |doi=10.1103/PhysRevC.95.014319 |publisher=American Physical Society}}{{cite web|url=https://www.nndc.bnl.gov/ensnds/223/Rn/adopted.pdf|title=Adopted Levels for ²²³Rn|publisher=NNDC Chart of Nuclides}}}}

| ²¹⁹Po

|-id=Radon-224

| ²²⁴Rn

| style="text-align:right" | 86

| style="text-align:right" | 138

| 224.024096(11)

| 107(3) min

| β⁻

| ²²⁴Fr

| 0+

|-id=Radon-225

| ²²⁵Rn

| style="text-align:right" | 86

| style="text-align:right" | 139

| 225.028486(12)

| 4.66(4) min

| β⁻

| ²²⁵Fr

| 7/2−

|-id=Radon-226

| ²²⁶Rn

| style="text-align:right" | 86

| style="text-align:right" | 140

| 226.030861(11)

| 7.4(1) min

| β⁻

| ²²⁶Fr

| 0+

|-id=Radon-227

| ²²⁷Rn

| style="text-align:right" | 86

| style="text-align:right" | 141

| 227.035304(15)

| 20.2(4) s

| β⁻

| ²²⁷Fr

| (3/2+)

|-id=Radon-228

| ²²⁸Rn

| style="text-align:right" | 86

| style="text-align:right" | 142

| 228.037835(19)

| 65(2) s

| β⁻

| ²²⁸Fr

| 0+

|-id=Radon-229

| ²²⁹Rn

| style="text-align:right" | 86

| style="text-align:right" | 143

| 229.042257(14)

| 11.9(13) s

| β⁻

| ²²⁹Fr

| (5/2+)

|-id=Radon-230

| ²³⁰Rn

| style="text-align:right" | 86

| style="text-align:right" | 144

| 230.04527(22)#

| 24# s
[>300 ns]

| β⁻?

| ²³⁰Fr

| 0+

|-id=Radon-231

| ²³¹Rn

| style="text-align:right" | 86

| style="text-align:right" | 145

| 231.04997(32)#

| 2# s
[>300 ns]

| β⁻?

| ²³¹Fr

| 1/2+#

References

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

Category:Radon

Radon