There are 39 known

isotopes Isotopes are distinct nuclear species (or ''nuclides'') of the same chemical element. They have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to the same chemical element), but ...

radon Radon is a chemical element; it has symbol Rn and atomic number 86. It is a radioactive noble gas and is colorless and odorless. Of the three naturally occurring radon isotopes, only Rn has a sufficiently long half-life (3.825 days) for it to b ...

(₈₆Rn), from ¹⁹³Rn to ²³¹Rn; all are

radioactive Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is conside ...

. The most stable

isotope Isotopes are distinct nuclear species (or ''nuclides'') of the same chemical element. They have the same atomic number (number of protons in their Atomic nucleus, nuclei) and position in the periodic table (and hence belong to the same chemica ...

is ²²²Rn with a

half-life Half-life is a mathematical and scientific description of exponential or gradual decay. Half-life, half life or halflife may also refer to: Film * Half-Life (film), ''Half-Life'' (film), a 2008 independent film by Jennifer Phang * ''Half Life: ...

of 3.8235 days, which decays into . Six isotopes of

, ^{217, 218, 219, 220, 221, 222}Rn, occur in trace quantities in nature as

decay product In nuclear physics, a decay product (also known as a daughter product, daughter isotope, radio-daughter, or daughter nuclide) is the remaining nuclide left over from radioactive decay. Radioactive decay often proceeds via a sequence of steps ( d ...

s of, respectively, ²¹⁷At, ²¹⁸At, ²²³Ra, ²²⁴Ra, ²²⁵Ra, and ²²⁶Ra. ²¹⁷Rn and ²²¹Rn are produced in rare branches in the

decay chain In nuclear science a decay chain refers to the predictable series of radioactive disintegrations undergone by the nuclei of certain unstable chemical elements. Radioactive isotopes do not usually decay directly to stable isotopes, but rather ...

of trace quantities of ²³⁷Np; ²²²Rn (and also ²¹⁸Rn in a rare branch) is an intermediate step in the

of ²³⁸U; ²¹⁹Rn is an intermediate step in the

of ²³⁵U; and ²²⁰Rn occurs in the

of ²³²Th.

List of isotopes

, -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 , 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

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 , 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? , 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: ** * Half-life, spin, and isomer data selected from the following sources. ** ** ** {{Authority control Radon

Radon Radon is a chemical element; it has symbol Rn and atomic number 86. It is a radioactive noble gas and is colorless and odorless. Of the three naturally occurring radon isotopes, only Rn has a sufficiently long half-life (3.825 days) for it to b ...