Table
| nuclide symbol |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s) |
daughter isotope(s) |
nuclear spin |
representative isotopic composition (mole fraction) |
range of natural variation (mole fraction) |
|---|---|---|---|---|---|---|---|---|---|
| excitation energy | |||||||||
| 191At | 85 | 106 | 1.7(+11-5) millisecond | (1/2+) | |||||
| 191mAt | 2.1(+4-3) millisecond | (7/2-) | |||||||
| 193At | 85 | 108 | 192.99984(6) | 28(+5-4) millisecond | alpha decay | 189Bi | (1/2+) | ||
| 193m1At | 50 keV | 21(5) ms | (7/2-) | ||||||
| 193m2At | 39 keV | 27(+4-5) ms | (13/2+) | ||||||
| 194At | 85 | 109 | 193.99873(20) | ~40 ms | α | 190Bi | 3+# | ||
| β+ (rare) | 194Po | ||||||||
| 194mAt | 480(190) keV | ~250 ms | α | 190Bi | 10-# | ||||
| IT (rare) | 194At | ||||||||
| 195At | 85 | 110 | 194.996268(10) | 328(20) ms | α (75%) | 191Bi | (1/2+) | ||
| β+ (25%) | 195Po | ||||||||
| 195mAt | 34(7) keV | 147(5) ms | 9/2-# | ||||||
| 196At | 85 | 111 | 195.99579(6) | 253(9) ms | α (96%) | 192Bi | 3+# | ||
| β+ (4.0%) | 196Po | ||||||||
| 196m1At | -30(80) keV | 20# ms | 10-# | ||||||
| 196m2At | 157.9(1) keV | 11 µs | 5+# | ||||||
| 197At | 85 | 112 | 196.99319(5) | 0.390(16) s | α (96%) | 193Bi | (9/2-) | ||
| β+ (4.0%) | 197Po | ||||||||
| 197mAt | 52(10) keV | 2.0(2) s | (1/2+) | ||||||
| 198At | 85 | 113 | 197.99284(5) | 4.2(3) s | α (94%) | 194Bi | (3+) | ||
| β+ (6%) | 198Po | ||||||||
| 198mAt | 330(90)# keV | 1.0(2) s | (10-) | ||||||
| 199At | 85 | 114 | 198.99053(5) | 6.92(13) s | α (89%) | 195Bi | (9/2-) | ||
| β+ (11%) | 199Po | ||||||||
| 200At | 85 | 115 | 199.990351(26) | 43.2(9) s | α (57%) | 196Bi | (3+) | ||
| β+ (43%) | 200Po | ||||||||
| 200m1At | 112.7(30) keV | 47(1) s | α (43%) | 196Bi | (7+) | ||||
| IT | 200At | ||||||||
| β+ | 200Po | ||||||||
| 200m2At | 344(3) keV | 3.5(2) s | (10-) | ||||||
| 201At | 85 | 116 | 200.988417(9) | 85(3) s | α (71%) | 197Bi | (9/2-) | ||
| β+ (29%) | 201Po | ||||||||
| 202At | 85 | 117 | 201.98863(3) | 184(1) s | β+ (88%) | 202Po | (2,3)+ | ||
| α (12%) | 198Bi | ||||||||
| 202m1At | 190(40) keV | 182(2) s | (7+) | ||||||
| 202m2At | 580(40) keV | 460(50) ms | (10-) | ||||||
| 203At | 85 | 118 | 202.986942(13) | 7.37(13) min | β+ (69%) | 203Po | 9/2- | ||
| α (31%) | 199Bi | ||||||||
| 204At | 85 | 119 | 203.987251(26) | 9.2(2) min | β+ (96%) | 204Po | 7+ | ||
| α (3.8%) | 200Bi | ||||||||
| 204mAt | 587.30(20) keV | 108(10) ms | IT | 204At | (10-) | ||||
| 205At | 85 | 120 | 204.986074(16) | 26.2(5) min | β+ (90%) | 205Po | 9/2- | ||
| α (10%) | 201Bi | ||||||||
| 205mAt | 2339.65(23) keV | 7.76(14) µs | 29/2+ | ||||||
| 206At | 85 | 121 | 205.986667(22) | 30.6(13) min | β+ (99.11%) | 206Po | (5)+ | ||
| α (0.9%) | 202Bi | ||||||||
| 206mAt | 807(3) keV | 410(80) ns | (10)- | ||||||
| 207At | 85 | 122 | 206.985784(23) | 1.80(4) h | β+ (91%) | 207Po | 9/2- | ||
| α (8.6%) | 203Bi | ||||||||
| 208At | 85 | 123 | 207.986590(28) | 1.63(3) h | β+ (99.5%) | 208Po | 6+ | ||
| α (0.55%) | 204Bi | ||||||||
| 209At | 85 | 124 | 208.986173(8) | 5.41(5) h | β+ (96%) | 209Po | 9/2- | ||
| α (4.0%) | 205Bi | ||||||||
| 210At | 85 | 125 | 209.987148(8) | 8.1(4) h | β+ (99.8%) | 210Po | (5)+ | ||
| α (0.18%) | 206Bi | ||||||||
| 210m1At | 2549.6(2) keV | 482(6) µs | (15)- | ||||||
| 210m2At | 4027.7(2) keV | 5.66(7) µs | (19)+ | ||||||
| 211At | 85 | 126 | 210.9874963(30) | 7.214(7) h | EC (58.2%) | 211Po | 9/2- | ||
| α (42%) | 207Bi | ||||||||
| 212At | 85 | 127 | 211.990745(8) | 0.314(2) s | α (99.95%) | 208Bi | (1-) | ||
| β+ (0.05%) | 212Po | ||||||||
| β- (2×10−6%) | 212Rn | ||||||||
| 212m1At | 223(7) keV | 0.119(3) s | α (99%) | 208Bi | (9-) | ||||
| IT (1%) | 212At | ||||||||
| 212m2At | 4771.6(11) keV | 152(5) µs | (25-) | ||||||
| 213At | 85 | 128 | 212.992937(5) | 125(6) ns | α | 209Bi | 9/2- | ||
| 214At | 85 | 129 | 213.996372(5) | 558(10) ns | α | 210Bi | 1- | ||
| 214m1At | 59(9) keV | 265(30) ns | |||||||
| 214m2At | 231(6) keV | 760(15) ns | 9- | ||||||
| 215At | 85 | 130 | 214.998653(7) | 0.10(2) ms | α | 211Bi | 9/2- | Trace | |
| 216At | 85 | 131 | 216.002423(4) | 0.30(3) ms | α (99.99%) | 212Bi | 1- | ||
| β- (.006%) | 216Rn | ||||||||
| EC (3×10−7%) | 216Po | ||||||||
| 216mAt | 413(5) keV | 100# µs | (9-) | ||||||
| 217At | 85 | 132 | 217.004719(5) | 32.3(4) ms | α (99.98%) | 213Bi | 9/2- | ||
| β- (.012%) | 217Rn | ||||||||
| 218At | 85 | 133 | 218.008694(12) | 1.5(3) s | α (99.9%) | 214Bi | 1-# | Trace | |
| β- (0.10%) | 218Rn | ||||||||
| 219At | 85 | 134 | 219.011162(4) | 56(3) s | α (97%) | 215Bi | 5/2-# | Trace | |
| β- (3.0%) | 219Rn | ||||||||
| 220At | 85 | 135 | 220.01541(6) | 3.71(4) min | β- (92%) | 220Rn | 3(-#) | ||
| α (8.0%) | 216Bi | ||||||||
| 221At | 85 | 136 | 221.01805(21)# | 2.3(2) min | β- | 221Rn | 3/2-# | ||
| 222At | 85 | 137 | 222.02233(32)# | 54(10) s | β- | 222Rn | |||
| 223At | 85 | 138 | 223.02519(43)# | 50(7) s | 3/2-# | ||||
Read more about this topic: Isotopes Of Astatine
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