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) ...

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

, ^{217, 218, 219, 220, 222}Rn 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

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

for ²³⁵U; and ²²⁰Rn occurs in the

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 β⁻β⁻ dacay to ²²⁰Ra , ²¹⁶Po , rowspan=2, 0+ , rowspan=2, TraceIntermediate decay product of ²³²Th , - , β⁻β⁻ (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 β⁻β⁻ 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 ...