Isotopes of radon
There are 37 known isotopes of radon (86Rn), from 195Rn to 231Rn; all are radioactive. The most stable isotope is 222Rn with a half-life of 3.823 days, which decays into 218
Po
. Five isotopes of radon, 217, 218, 219, 220, 222Rn occur in trace quantities in nature as decay products of, respectively, 217At, 218At, 223Ra, 224Ra, and 226Ra. 217Rn is produced in a rare branch in the decay chain of trace quantities of 237Np, 218Rn and 222Rn are intermediate steps in the decay chain for 238U, with 219Rn an intermediate step in the decay chain for 235U, and 220Rn occurring in the decay chain for 232Th.
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List of isotopes
Nuclide [n 1] |
Historic name |
Z | N | Isotopic mass (Da) [n 2][n 3] |
Half-life |
Decay mode |
Daughter isotope |
Spin and parity [n 4][n 5] |
Isotopic abundance |
---|---|---|---|---|---|---|---|---|---|
Excitation energy[n 5] | |||||||||
195Rn | 86 | 109 | 195.00544(5) | 6 ms | 3/2−# | ||||
195mRn | 50(50) keV | 6 ms | 13/2+# | ||||||
196Rn | 86 | 110 | 196.002115(16) | 4.7(11) ms [4.4(+13−9) ms] |
α | 192Po | 0+ | ||
β+ (rare) | 196At | ||||||||
197Rn | 86 | 111 | 197.00158(7) | 66(16) ms [65(+23−14) ms] |
α | 193Po | 3/2−# | ||
β+ (rare) | 197At | ||||||||
197mRn | 200(60)# keV | 21(5) ms [19(+8−4) ms] |
α | 193Po | (13/2+) | ||||
β+ (rare) | 197At | ||||||||
198Rn | 86 | 112 | 197.998679(14) | 65(3) ms | α (99%) | 194Po | 0+ | ||
β+ (1%) | 198At | ||||||||
199Rn | 86 | 113 | 198.99837(7) | 620(30) ms | α (94%) | 195Po | 3/2−# | ||
β+ (6%) | 199At | ||||||||
199mRn | 180(70) keV | 320(20) ms | α (97%) | 195Po | 13/2+# | ||||
β+ (3%) | 199At | ||||||||
200Rn | 86 | 114 | 199.995699(14) | 0.96(3) s | α (98%) | 196Po | 0+ | ||
β+ (2%) | 200At | ||||||||
201Rn | 86 | 115 | 200.99563(8) | 7.0(4) s | α (80%) | 197Po | (3/2−) | ||
β+ (20%) | 201At | ||||||||
201mRn | 280(90)# keV | 3.8(1) s | α (90%) | 197Po | (13/2+) | ||||
β+ (10%) | 201At | ||||||||
IT (<1%) | 201Rn | ||||||||
202Rn | 86 | 116 | 201.993263(19) | 9.94(18) s | α (85%) | 198Po | 0+ | ||
β+ (15%) | 202At | ||||||||
203Rn | 86 | 117 | 202.993387(25) | 44.2(16) s | α (66%) | 199Po | (3/2−) | ||
β+ (34%) | 203At | ||||||||
203mRn | 363(4) keV | 26.7(5) s | α (80%) | 199Po | 13/2(+) | ||||
β+ (20%) | 203At | ||||||||
204Rn | 86 | 118 | 203.991429(16) | 1.17(18) min | α (73%) | 200Po | 0+ | ||
β+ (27%) | 204At | ||||||||
205Rn | 86 | 119 | 204.99172(5) | 170(4) s | β+ (77%) | 205At | 5/2− | ||
α (23%) | 201Po | ||||||||
206Rn | 86 | 120 | 205.990214(16) | 5.67(17) min | α (62%) | 202Po | 0+ | ||
β+ (38%) | 206At | ||||||||
207Rn | 86 | 121 | 206.990734(28) | 9.25(17) min | β+ (79%) | 207At | 5/2− | ||
α (21%) | 203Po | ||||||||
207mRn | 899.0(10) keV | 181(18) µs | (13/2+) | ||||||
208Rn | 86 | 122 | 207.989642(12) | 24.35(14) min | α (62%) | 204Po | 0+ | ||
β+ (38%) | 208At | ||||||||
209Rn | 86 | 123 | 208.990415(21) | 28.5(10) min | β+ (83%) | 209At | 5/2− | ||
α (17%) | 205Po | ||||||||
209m1Rn | 1173.98(13) keV | 13.4(13) µs | 13/2+ | ||||||
209m2Rn | 3636.78(23) keV | 3.0(3) µs | (35/2+) | ||||||
210Rn | 86 | 124 | 209.989696(9) | 2.4(1) h | α (96%) | 206Po | 0+ | ||
β+ (4%) | 210At | ||||||||
210m1Rn | 1690(15) keV | 644(40) ns | 8+# | ||||||
210m2Rn | 3837(15) keV | 1.06(5) µs | (17)− | ||||||
210m3Rn | 6493(15) keV | 1.04(7) µs | (22)+ | ||||||
211Rn | 86 | 125 | 210.990601(7) | 14.6(2) h | α (72.6%) | 207Po | 1/2− | ||
β+ (27.4%) | 211At | ||||||||
212Rn | 86 | 126 | 211.990704(3) | 23.9(12) min | α | 208Po | 0+ | ||
β+β+ (rare) | 212Po | ||||||||
213Rn | 86 | 127 | 212.993883(6) | 19.5(1) ms | α | 209Po | (9/2+) | ||
214Rn | 86 | 128 | 213.995363(10) | 0.27(2) µs | α | 210Po | 0+ | ||
β+β+ (rare) | 214Po | ||||||||
214mRn | 4595.4 keV | 245(30) ns | (22+) | ||||||
215Rn | 86 | 129 | 214.998745(8) | 2.30(10) µs | α | 211Po | 9/2+ | ||
216Rn | 86 | 130 | 216.000274(8) | 45(5) µs | α | 212Po | 0+ | ||
217Rn | 86 | 131 | 217.003928(5) | 0.54(5) ms | α | 213Po | 9/2+ | Trace[n 6] | |
218Rn | 86 | 132 | 218.0056013(25) | 35(5) ms | α | 214Po | 0+ | Trace[n 7] | |
219Rn | Actinon Actinium emanation |
86 | 133 | 219.0094802(27) | 3.96(1) s | α | 215Po | 5/2+ | Trace[n 8] |
220Rn | Thoron Thorium emanation |
86 | 134 | 220.0113940(24) | 55.6(1) s | α | 216Po | 0+ | Trace[n 9] |
β−β− (rare) | 220Ra | ||||||||
221Rn | 86 | 135 | 221.015537(6) | 25.7(5) min | β− (78%) | 221Fr | 7/2(+) | ||
α (22%) | 217Po | ||||||||
222Rn | Radon[n 10] Radium emanation Emanation Emanon Niton |
86 | 136 | 222.0175777(25) | 3.8235(3) d | α | 218Po | 0+ | Trace[n 7] |
223Rn | 86 | 137 | 223.02179(32)# | 24.3(4) min | β− | 223Fr | 7/2 | ||
224Rn | 86 | 138 | 224.02409(32)# | 107(3) min | β− | 224Fr | 0+ | ||
225Rn | 86 | 139 | 225.02844(32)# | 4.66(4) min | β− | 225Fr | 7/2− | ||
226Rn | 86 | 140 | 226.03089(43)# | 7.4(1) min | β− | 226Fr | 0+ | ||
227Rn | 86 | 141 | 227.03541(45)# | 20.8(7) s | β− | 227Fr | 5/2(+#) | ||
228Rn | 86 | 142 | 228.03799(44)# | 65(2) s | β− | 228Fr | 0+ | ||
229Rn[1] | 86 | 143 | 229.0426536(141) | 12(1) s | β− | 229Fr | |||
230Rn[2] | 86 | 144 | β− | 230Fr | 0+ | ||||
231Rn[3] | 86 | 145 | β− | 231Fr |
- mRn – Excited nuclear isomer.
- ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
- # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
- ( ) spin value – Indicates spin with weak assignment arguments.
- # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
- Intermediate decay product of 237Np
- Intermediate decay product of 238U
- Intermediate decay product of 235U
- Intermediate decay product of 232Th
- Source of element's name
References
- Neidherr, D.; Audi, G.; Beck, D.; Baum, K.; Böhm, Ch.; Breitenfeldt, M.; Cakirli, R. B.; Casten, R. F.; George, S.; Herfurth, F.; Herlert, A.; Kellerbauer, A.; Kowalska, M.; Lunney, D.; Minaya-Ramirez, E.; Naimi, S.; Noah, E.; Penescu, L.; Rosenbusch, M.; Schwarz, S.; Schweikhard, L.; Stora, T. (19 March 2009). "Discovery of 229Rn and the Structure of the Heaviest Rn and Ra Isotopes from Penning-Trap Mass Measurements" (PDF). Physical Review Letters. 102 (11): 112501–1–112501–5. Bibcode:2009PhRvL.102k2501N. doi:10.1103/PhysRevLett.102.112501. PMID 19392194.
- "
- Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- Isotopic compositions and standard atomic masses from:
- de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051. Lay summary.
- Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.
- Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.
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