A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
| |||||||||||||||||||||||||||||||||||
Standard atomic weight Ar°(Re) | |||||||||||||||||||||||||||||||||||
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Naturally occurring rhenium (75Re) is 37.4% 185Re, which is stable (although it is predicted to decay), and 62.6% 187Re, which is unstable but has a very long half-life (4.12×1010 years).[4] Among elements with a known stable isotope, only indium and tellurium similarly occur with a stable isotope in lower abundance than the long-lived radioactive isotope.
There are 36 other unstable isotopes recognized, the longest-lived of which are 183Re with a half-life of 70 days, 184Re with a half-life of 38 days, 186Re with a half-life of 3.7186 days, 182Re with a half-life of 64.0 hours, and 189Re with a half-life of 24.3 hours. There are also numerous isomers, the longest-lived of which are 186mRe with a half-life of 200,000 years and 184mRe with a half-life of 177.25 days.[5] All others have half-lives less than a day.
List of isotopes
Nuclide [n 1] |
Z | N | Isotopic mass (Da) [n 2][n 3] |
Half-life [n 4][n 5] |
Decay mode [n 6] |
Daughter isotope [n 7][n 8] |
Spin and parity [n 9][n 5] |
Natural abundance (mole fraction) | |
---|---|---|---|---|---|---|---|---|---|
Excitation energy[n 5] | Normal proportion | Range of variation | |||||||
159Re[6] | 75 | 84 | 21(4) μs | p (92.5%) | 158W | (11/2−) | |||
α (7.5%) | 155Ta | ||||||||
160Re[7] | 75 | 85 | 159.98212(43)# | 611(7) μs | p (89%) | 159W | (2−) | ||
α (11%) | 156Ta | ||||||||
160mRe[8] | 185(21)# keV | 2.8(1) μs | IT | 160Re | (9+) | ||||
161Re | 75 | 86 | 160.97759(22) | 0.37(4) ms | p | 160W | 1/2+ | ||
161mRe | 123.8(13) keV | 15.6(9) ms | α | 157Ta | 11/2− | ||||
162Re | 75 | 87 | 161.97600(22)# | 107(13) ms | α (94%) | 158Ta | (2−) | ||
β+ (6%) | 162W | ||||||||
162mRe | 173(10) keV | 77(9) ms | α (91%) | 158Ta | (9+) | ||||
β+ (9%) | 162W | ||||||||
163Re | 75 | 88 | 162.972081(21) | 390(70) ms | β+ (68%) | 163W | (1/2+) | ||
α (32%) | 159Ta | ||||||||
163mRe | 115(4) keV | 214(5) ms | α (66%) | 159Ta | (11/2−) | ||||
β+ (34%) | 163W | ||||||||
164Re | 75 | 89 | 163.97032(17)# | 0.53(23) s | α (58%) | 160Ta | high | ||
β+ (42%) | 164W | ||||||||
164mRe | 120(120)# keV | 530(230) ms | (2#)− | ||||||
165Re | 75 | 90 | 164.967089(30) | 1# s | β+ | 165W | 1/2+# | ||
α | 161Ta | ||||||||
165mRe | 47(26) keV | 2.1(3) s | β+ (87%) | 165W | 11/2−# | ||||
α (13%) | 161Ta | ||||||||
166Re | 75 | 91 | 165.96581(9)# | 2# s | β+ | 166W | 2−# | ||
α | 162Ta | ||||||||
167Re | 75 | 92 | 166.96260(6)# | 3.4(4) s | α | 163Ta | 9/2−# | ||
β+ | 167W | ||||||||
167mRe | 130(40)# keV | 5.9(3) s | β+ (99.3%) | 167W | 1/2+# | ||||
α (.7%) | 163Ta | ||||||||
168Re | 75 | 93 | 167.96157(3) | 4.4(1) s | β+ (99.99%) | 168W | (5+, 6+, 7+) | ||
α (.005%) | 164Ta | ||||||||
168mRe | non-exist | 6.6(15) s | |||||||
169Re | 75 | 94 | 168.95879(3) | 8.1(5) s | β+ (99.99%) | 169W | 9/2−# | ||
α (.005%) | 165Ta | ||||||||
169mRe | 145(29) keV | 15.1(15) s | β+ (99.8%) | 169W | 1/2+# | ||||
α (.2%) | 164Ta | ||||||||
170Re | 75 | 95 | 169.958220(28) | 9.2(2) s | β+ (99.99%) | 170W | (5+) | ||
α (.01%) | 166Ta | ||||||||
171Re | 75 | 96 | 170.95572(3) | 15.2(4) s | β+ | 171W | (9/2−) | ||
172Re | 75 | 97 | 171.95542(6) | 15(3) s | β+ | 172W | (5) | ||
172mRe | 0(100)# keV | 55(5) s | β+ | 172W | (2) | ||||
173Re | 75 | 98 | 172.95324(3) | 1.98(26) min | β+ | 173W | (5/2−) | ||
174Re | 75 | 99 | 173.95312(3) | 2.40(4) min | β+ | 174W | |||
175Re | 75 | 100 | 174.95138(3) | 5.89(5) min | β+ | 175W | (5/2−) | ||
176Re | 75 | 101 | 175.95162(3) | 5.3(3) min | β+ | 176W | 3+ | ||
177Re | 75 | 102 | 176.95033(3) | 14(1) min | β+ | 177W | 5/2− | ||
177mRe | 84.71(10) keV | 50(10) μs | 5/2+ | ||||||
178Re | 75 | 103 | 177.95099(3) | 13.2(2) min | β+ | 178W | (3+) | ||
179Re | 75 | 104 | 178.949988(26) | 19.5(1) min | β+ | 179W | (5/2)+ | ||
179m1Re | 65.39(9) keV | 95(25) μs | (5/2−) | ||||||
179m2Re | 1684.59(14)+Y keV | >0.4 μs | (23/2+) | ||||||
180Re | 75 | 105 | 179.950789(23) | 2.44(6) min | β+ | 180W
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