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There are 37 known
isotopes Isotopes are two or more types of atoms that 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), and that differ in nucleon numbers (mass numbers) ...
of
radon Radon is a chemical element with the symbol Rn and atomic number 86. It is a radioactive, colourless, odourless, tasteless noble gas. It occurs naturally in minute quantities as an intermediate step in the normal radioactive decay chains through ...
(86Rn), from 195Rn 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 consi ...
. The most stable
isotope Isotopes are two or more types of atoms that 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), and that differ in nucleon numbers (mass numb ...
is 222Rn with a
half-life Half-life (symbol ) is the time required for a quantity (of substance) to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable at ...
of 3.823 days, which decays into . Five isotopes of
radon Radon is a chemical element with the symbol Rn and atomic number 86. It is a radioactive, colourless, odourless, tasteless noble gas. It occurs naturally in minute quantities as an intermediate step in the normal radioactive decay chains through ...
, 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 In nuclear science, the decay chain refers to a series of radioactive decays of different radioactive decay products as a sequential series of transformations. It is also known as a "radioactive cascade". Most radioisotopes do not decay dire ...
of trace quantities of 237Np; 218Rn and 222Rn are intermediate steps in the
decay chain In nuclear science, the decay chain refers to a series of radioactive decays of different radioactive decay products as a sequential series of transformations. It is also known as a "radioactive cascade". Most radioisotopes do not decay dire ...
for 238U; 219Rn is an intermediate step in the
decay chain In nuclear science, the decay chain refers to a series of radioactive decays of different radioactive decay products as a sequential series of transformations. It is also known as a "radioactive cascade". Most radioisotopes do not decay dire ...
for 235U; and 220Rn occurs in the
decay chain In nuclear science, the decay chain refers to a series of radioactive decays of different radioactive decay products as a sequential series of transformations. It is also known as a "radioactive cascade". Most radioisotopes do not decay dire ...
for 232Th.


List of isotopes

, - , 195Rn , , style="text-align:right" , 86 , style="text-align:right" , 109 , 195.00544(5) , 6 ms , , , 3/2−# , , - , style="text-indent:1em" , 195mRn , , colspan="3" style="text-indent:2em" , 50(50) keV , 6 ms , , , 13/2+# , , - , rowspan=2, 196Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 110 , rowspan=2, 196.002115(16) , rowspan=2, 4.7(11) ms
.4(+13−9) ms, α , 192Po , rowspan=2, 0+ , rowspan=2, , - , β+ (rare) , 196At , - , rowspan=2, 197Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 111 , rowspan=2, 197.00158(7) , rowspan=2, 66(16) ms
5(+23−14) ms, α , 193Po , rowspan=2, 3/2−# , rowspan=2, , - , β+ (rare) , 197At , - , rowspan=2 style="text-indent:1em" , 197mRn , rowspan=2, , rowspan=2 colspan="3" style="text-indent:2em" , 200(60)# keV , rowspan=2, 21(5) ms
9(+8−4) ms, α , 193Po , rowspan=2, (13/2+) , rowspan=2, , - , β+ (rare) , 197At , - , 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, 65(3) ms , α (99%) , 194Po , rowspan=2, 0+ , rowspan=2, , - , β+ (1%) , 198At , - , rowspan=2, 199Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 113 , rowspan=2, 198.99837(7) , rowspan=2, 620(30) ms , α (94%) , 195Po , rowspan=2, 3/2−# , rowspan=2, , - , β+ (6%) , 199At , - , rowspan=2 style="text-indent:1em" , 199mRn , rowspan=2, , rowspan=2 colspan="3" style="text-indent:2em" , 180(70) keV , rowspan=2, 320(20) ms , α (97%) , 195Po , rowspan=2, 13/2+# , rowspan=2, , - , β+ (3%) , 199At , - , rowspan=2, 200Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 114 , rowspan=2, 199.995699(14) , rowspan=2, 0.96(3) s , α (98%) , 196Po , rowspan=2, 0+ , rowspan=2, , - , β+ (2%) , 200At , - , rowspan=2, 201Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 115 , rowspan=2, 200.99563(8) , rowspan=2, 7.0(4) s , α (80%) , 197Po , rowspan=2, (3/2−) , rowspan=2, , - , β+ (20%) , 201At , - , rowspan=3 style="text-indent:1em" , 201mRn , rowspan=3, , rowspan=3 colspan="3" style="text-indent:2em" , 280(90)# keV , rowspan=3, 3.8(1) s , α (90%) , 197Po , rowspan=3, (13/2+) , rowspan=3, , - , β+ (10%) , 201At , - , IT (<1%) , 201Rn , - , rowspan=2, 202Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 116 , rowspan=2, 201.993263(19) , rowspan=2, 9.94(18) s , α (85%) , 198Po , rowspan=2, 0+ , rowspan=2, , - , β+ (15%) , 202At , - , rowspan=2, 203Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 117 , rowspan=2, 202.993387(25) , rowspan=2, 44.2(16) s , α (66%) , 199Po , rowspan=2, (3/2−) , rowspan=2, , - , β+ (34%) , 203At , - , rowspan=2 style="text-indent:1em" , 203mRn , rowspan=2, , rowspan=2 colspan="3" style="text-indent:2em" , 363(4) keV , rowspan=2, 26.7(5) s , α (80%) , 199Po , rowspan=2, 13/2(+) , rowspan=2, , - , β+ (20%) , 203At , - , rowspan=2, 204Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 118 , rowspan=2, 203.991429(16) , rowspan=2, 1.17(18) min , α (73%) , 200Po , rowspan=2, 0+ , rowspan=2, , - , β+ (27%) , 204At , - , rowspan=2, 205Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 119 , rowspan=2, 204.99172(5) , rowspan=2, 170(4) s , β+ (77%) , 205At , rowspan=2, 5/2− , rowspan=2, , - , α (23%) , 201Po , - , rowspan=2, 206Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 120 , rowspan=2, 205.990214(16) , rowspan=2, 5.67(17) min , α (62%) , 202Po , rowspan=2, 0+ , rowspan=2, , - , β+ (38%) , 206At , - , rowspan=2, 207Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 121 , rowspan=2, 206.990734(28) , rowspan=2, 9.25(17) min , β+ (79%) , 207At , rowspan=2, 5/2− , rowspan=2, , - , α (21%) , 203Po , - , style="text-indent:1em" , 207mRn , , colspan="3" style="text-indent:2em" , 899.0(10) keV , 181(18) µs , , , (13/2+) , , - , rowspan=2, 208Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 122 , rowspan=2, 207.989642(12) , rowspan=2, 24.35(14) min , α (62%) , 204Po , rowspan=2, 0+ , rowspan=2, , - , β+ (38%) , 208At , - , rowspan=2, 209Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 123 , rowspan=2, 208.990415(21) , rowspan=2, 28.5(10) min , β+ (83%) , 209At , rowspan=2, 5/2− , rowspan=2, , - , α (17%) , 205Po , - , style="text-indent:1em" , 209m1Rn , , colspan="3" style="text-indent:2em" , 1173.98(13) keV , 13.4(13) µs , , , 13/2+ , , - , style="text-indent:1em" , 209m2Rn , , colspan="3" style="text-indent:2em" , 3636.78(23) keV , 3.0(3) µs , , , (35/2+) , , - , rowspan=2, 210Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 124 , rowspan=2, 209.989696(9) , rowspan=2, 2.4(1) h , α (96%) , 206Po , rowspan=2, 0+ , rowspan=2, , - , β+ (4%) , 210At , - , style="text-indent:1em" , 210m1Rn , , colspan="3" style="text-indent:2em" , 1690(15) keV , 644(40) ns , , , 8+# , , - , style="text-indent:1em" , 210m2Rn , , colspan="3" style="text-indent:2em" , 3837(15) keV , 1.06(5) µs , , , (17)− , , - , style="text-indent:1em" , 210m3Rn , , colspan="3" style="text-indent:2em" , 6493(15) keV , 1.04(7) µs , , , (22)+ , , - , rowspan=2, 211Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 125 , rowspan=2, 210.990601(7) , rowspan=2, 14.6(2) h , α (72.6%) , 207Po , rowspan=2, 1/2− , rowspan=2, , - , β+ (27.4%) , 211At , - , rowspan=2, 212Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 126 , rowspan=2, 211.990704(3) , rowspan=2, 23.9(12) min , α , 208Po , rowspan=2, 0+ , rowspan=2, , - , β+β+ (rare) , 212Po , - , 213Rn , , style="text-align:right" , 86 , style="text-align:right" , 127 , 212.993883(6) , 19.5(1) ms , α , 209Po , (9/2+) , , - , rowspan=2, 214Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 128 , rowspan=2, 213.995363(10) , rowspan=2, 0.27(2) µs , α , 210Po , rowspan=2, 0+ , rowspan=2, , - , β+β+ (rare) , 214Po , - , style="text-indent:1em" , 214mRn , , colspan="3" style="text-indent:2em" , 4595.4 keV , 245(30) ns , , , (22+) , , - , 215Rn , , style="text-align:right" , 86 , style="text-align:right" , 129 , 214.998745(8) , 2.30(10) µs , α , 211Po , 9/2+ , , - , 216Rn , , style="text-align:right" , 86 , style="text-align:right" , 130 , 216.000274(8) , 45(5) µs , α , 212Po , 0+ , , - , 217Rn , , style="text-align:right" , 86 , style="text-align:right" , 131 , 217.003928(5) , 0.54(5) ms , α , 213Po , 9/2+ , TraceIntermediate decay product of 237Np , - , 218Rn , , style="text-align:right" , 86 , style="text-align:right" , 132 , 218.0056013(25) , 35(5) ms , α , 214Po , 0+ , TraceIntermediate decay product of 238U , - , 219Rn , Actinon
Actinium emanation , style="text-align:right" , 86 , style="text-align:right" , 133 , 219.0094802(27) , 3.96(1) s , α , 215Po , 5/2+ , TraceIntermediate decay product of 235U , - , rowspan=2, 220Rn , rowspan=2, Thoron
Thorium emanation , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 134 , rowspan=2, 220.0113940(24) , rowspan=2, 55.6(1) s , αTheorized to also undergo ββ dacay to 220Ra , 216Po , rowspan=2, 0+ , rowspan=2, TraceIntermediate decay product of 232Th , - , ββ (rare)Predicted, but never observed , 220Ra , - , rowspan=2, 221Rn , rowspan=2, , rowspan=2 style="text-align:right" , 86 , rowspan=2 style="text-align:right" , 135 , rowspan=2, 221.015537(6) , rowspan=2, 25.7(5) min , β (78%) , 221Fr , rowspan=2, 7/2(+) , rowspan=2, , - , α (22%) , 217Po , - , 222Rn , RadonSource of element's name
Radium emanation
Emanation
Emanon
Niton , style="text-align:right" , 86 , style="text-align:right" , 136 , 222.0175777(25) , 3.8235(3) d , αTheorized to also undergo ββ dacay to 222Ra , 218Po , 0+ , Trace , - , 223Rn , , style="text-align:right" , 86 , style="text-align:right" , 137 , 223.02179(32)# , 24.3(4) min , β , 223Fr , 7/2 , , - , 224Rn , , style="text-align:right" , 86 , style="text-align:right" , 138 , 224.02409(32)# , 107(3) min , β , 224Fr , 0+ , , - , 225Rn , , style="text-align:right" , 86 , style="text-align:right" , 139 , 225.02844(32)# , 4.66(4) min , β , 225Fr , 7/2− , , - , 226Rn , , style="text-align:right" , 86 , style="text-align:right" , 140 , 226.03089(43)# , 7.4(1) min , β , 226Fr , 0+ , , - , 227Rn , , style="text-align:right" , 86 , style="text-align:right" , 141 , 227.03541(45)# , 20.8(7) s , β , 227Fr , 5/2(+#) , , - , 228Rn , , style="text-align:right" , 86 , style="text-align:right" , 142 , 228.03799(44)# , 65(2) s , β , 228Fr , 0+ , , - , 229Rn , , style="text-align:right" , 86 , style="text-align:right" , 143 , 229.0426536(141) , 12(1) s , β , 229Fr , , , - , 230Rn , , style="text-align:right" , 86 , style="text-align:right" , 144 , , , β , 230Fr , 0+ , , - , 231Rn
, , style="text-align:right" , 86 , style="text-align:right" , 145 , , , β , 231Fr , ,


References

* Isotope masses from: ** * Isotopic compositions and standard atomic masses from: ** ** * Half-life, spin, and isomer data selected from the following sources. ** ** ** {{Authority control Isotopes of radon, Radon
Radon Radon is a chemical element with the symbol Rn and atomic number 86. It is a radioactive, colourless, odourless, tasteless noble gas. It occurs naturally in minute quantities as an intermediate step in the normal radioactive decay chains through ...