Physics:Isotopes of platinum
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Short description: Nuclides with atomic number of 78 but with different mass numbers
Naturally occurring platinum (78Pt) consists of five stable isotopes (192Pt, 194Pt, 195Pt, 196Pt, 198Pt) and one very long-lived (half-life 4.83×1011 years) radioisotope (190Pt). There are also 34 known synthetic radioisotopes, the longest-lived of which is 193Pt with a half-life of 50 years. All other isotopes have half-lives under a year, most under a day. All isotopes of platinum are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed. Platinum-195 is the most abundant isotope.
List of isotopes
Nuclide [n 1] |
Z | N | Isotopic mass (u) [n 2][n 3] |
Half-life [n 4] |
Decay mode [n 5] |
Daughter isotope [n 6][n 7] |
Spin and parity [n 8][n 9] |
Physics:Natural abundance (mole fraction) | |
---|---|---|---|---|---|---|---|---|---|
Excitation energy[n 9] | Normal proportion | Range of variation | |||||||
165Pt | 78 | 87 | 164.99966(43)# | 370(180) μs | α | 161Os | 7/2−# | ||
166Pt | 78 | 88 | 165.99487(32)# | 294(62) μs | α | 162Os | 0+ | ||
167Pt | 78 | 89 | 166.99275(33)# | 920(120) μs | α | 163Os | 7/2−# | ||
168Pt | 78 | 90 | 167.98818(16) | 2.02(10) ms | α | 164Os | 0+ | ||
β+ ? | 168Ir | ||||||||
169Pt | 78 | 91 | 168.98662(22)# | 6.99(9) ms | α | 165Os | (7/2−) | ||
β+ ? | 169Ir | ||||||||
170Pt | 78 | 92 | 169.982502(20) | 13.93(16) ms | α | 166Os | 0+ | ||
β+ ? | 170Ir | ||||||||
171Pt | 78 | 93 | 170.981249(87) | 45.5(25) ms | α (86%) | 167Os | 7/2− | ||
β+ (14%) | 171Ir | ||||||||
171mPt | 412.6(10) keV | 901(9) ns | IT | 171Pt | 13/2+ | ||||
172Pt | 78 | 94 | 171.977341(11) | 97.6(13) ms | α (96%) | 168Os | 0+ | ||
β+ (4%) | 172Ir | ||||||||
173Pt | 78 | 95 | 172.976450(68) | 382(2) ms | α (86%) | 169Os | (5/2−) | ||
β+ (14%) | 173Ir | ||||||||
174Pt | 78 | 96 | 173.972820(11) | 862(8) ms | α (74.9%) | 170Os | 0+ | ||
β+ (25.1%) | 174Ir | ||||||||
175Pt | 78 | 97 | 174.972401(20) | 2.43(4) s | α (64%) | 171Os | (7/2−) | ||
β+ (36%) | 175Ir | ||||||||
176Pt | 78 | 98 | 175.968938(14) | 6.33(15) s | β+ (60%) | 176Ir | 0+ | ||
α (40%) | 172Os | ||||||||
177Pt | 78 | 99 | 176.968470(16) | 10.0(04) s | β+ (94.3%) | 177Ir | 5/2− | ||
α (5.7%) | 173Os | ||||||||
177mPt | 147.5(4) keV | 2.35(4) μs | IT | 177Pt | 1/2− | ||||
178Pt | 78 | 100 | 177.965649(11) | 20.7(7) s | β+ (92.3%) | 178Ir | 0+ | ||
α (7.7%) | 174Os | ||||||||
179Pt | 78 | 101 | 178.9653588(86) | 21.2(4) s | β+ (99.76%) | 179Ir | 1/2− | ||
α (0.24%) | 175Os | ||||||||
180Pt | 78 | 102 | 179.963038(11) | 56(3) s | β+ (99.48%) | 180Ir | 0+ | ||
α (0.52%) | 176Os | ||||||||
181Pt | 78 | 103 | 180.963090(15) | 52.0(22) s | β+ (99.93%) | 181Ir | 1/2− | ||
α (0.074%) | 177Os | ||||||||
181mPt | 116.65(8) keV | >300 ns | IT | 181Pt | 7/2− | ||||
182Pt | 78 | 104 | 181.961172(14) | 2.67(12) min | β+ (99.962%) | 182Ir | 0+ | ||
α (0.038%) | 178Os | ||||||||
183Pt | 78 | 105 | 182.961596(15) | 6.5(10) min | β+ (99.99%) | 183Ir | 1/2− | ||
α (0.0096%) | 179Os | ||||||||
183m1Pt | 34.74(7) keV | 43(5) s | β+ (96.9%) | 183Ir | 7/2− | ||||
IT (3.1%) | 183Pt | ||||||||
α ? | 179Os | ||||||||
183m2Pt | 195.90(10) keV | >150 ns | IT | 183Pt | 9/2+ | ||||
184Pt | 78 | 106 | 183.959922(16) | 17.3(2) min | β+ | 184Ir | 0+ | ||
α (0.0017%) | 180Os | ||||||||
184mPt | 1840.3(8) keV | 1.01(5) ms | IT | 184Pt | 8− | ||||
185Pt | 78 | 107 | 184.960614(28) | 70.9(24) min | β+ | 185Ir | 9/2+ | ||
α (0.0050%) | 181Os | ||||||||
185m1Pt | 103.41(5) keV | 33.0(8) min | β+ | 185Ir | 1/2− | ||||
185m2Pt | 200.89(4) keV | 728(20) ns | IT | 185Pt | 5/2− | ||||
186Pt | 78 | 108 | 185.959351(23) | 2.08(5) h | β+ | 186Ir | 0+ | ||
α (1.4×10−4%) | 182Os | ||||||||
187Pt | 78 | 109 | 186.960617(26) | 2.35(3) h | β+ | 187Ir | 3/2− | ||
187mPt | 174.38(22) keV | 311(15) μs | IT | 187Pt | 11/2+ | ||||
188Pt | 78 | 110 | 187.9593975(57) | 10.16(18) d | EC | 188Ir | 0+ | ||
α (2.6×10−5%) | 184Os | ||||||||
189Pt | 78 | 111 | 188.960848(11) | 10.87(12) h | β+ | 189Ir | 3/2− | ||
189m1Pt | 172.79(6) keV | 464(25) ns | IT | 189Pt | 9/2− | ||||
189m2Pt | 191.6(4) keV | 143(5) μs | IT | 189Pt | (13/2+) | ||||
190Pt | 78 | 112 | 189.95994982(71) | 4.83(3)×1011 y | α[n 10] | 186Os | 0+ | 1.2(2)×10−4 | |
191Pt | 78 | 113 | 190.9616763(44) | 2.83(2) d | EC | 191Ir | 3/2− | ||
191m1Pt | 100.663(20) keV | >1 μs | IT | 191Pt | 9/2− | ||||
191m2Pt | 149.035(22) keV | 95(5) μs | IT | 191Pt | 13/2+ | ||||
192Pt | 78 | 114 | 191.9610427(28) | Observationally Stable[n 11] | 0+ | 0.00782(24) | |||
192mPt | 2172.37(13) keV | 272(23) ns | IT | 192Pt | 10− | ||||
193Pt | 78 | 115 | 192.9629845(15) | 50(6) y | EC | 193Ir | 1/2− | ||
193mPt | 149.78(4) keV | 4.33(3) d | IT | 193Pt | 13/2+ | ||||
194Pt | 78 | 116 | 193.96268350(53) | Observationally Stable[n 12] | 0+ | 0.3286(41) | |||
195Pt | 78 | 117 | 194.96479433(54) | Observationally Stable[n 13] | 1/2− | 0.3378(24) | |||
195mPt | 259.077(23) keV | 4.010(5) d | IT | 195Pt | 13/2+ | ||||
196Pt | 78 | 118 | 195.96495465(55) | Observationally Stable[n 14] | 0+ | 0.2521(34) | |||
197Pt | 78 | 119 | 196.96734303(58) | 19.8915(19) h | β− | 197Au | 1/2− | ||
197mPt | 399.59(20) keV | 95.41(18) min | IT (96.7%) | 197Pt | 13/2+ | ||||
β− (3.3%) | 197Au | ||||||||
198Pt | 78 | 120 | 197.9678967(23) | Observationally Stable[n 15] | 0+ | 0.0734(13) | |||
199Pt | 78 | 121 | 198.9705970(23) | 30.80(21) min | β− | 199Au | 5/2− | ||
199mPt | 424(2) keV | 13.48(16) s | IT | 199Pt | 13/2+ | ||||
200Pt | 78 | 122 | 199.971445(22) | 12.6(3) h | β− | 200Au | 0+ | ||
201Pt | 78 | 123 | 200.974513(54) | 2.5(1) min | β− | 201Au | (5/2−) | ||
202Pt | 78 | 124 | 201.975639(27) | 44(15) h | β− | 202Au | 0+ | ||
202mPt | 1788.5(4) keV | 141(7) μs | IT | 202Pt | (7−) | ||||
203Pt | 78 | 125 | 202.97906(22)# | 22(4) s | β− | 203Au | (1/2−) | ||
203m1Pt | 1367(3)# keV | 12(5) s | β− | 203Au | 13/2+# | ||||
IT ? | 203Pt | ||||||||
203m2Pt | 1420(50)# keV | >100# ns | IT | 203Pt | 27/2−# | ||||
203m3Pt | 2530(50)# keV | 641(55) ns | IT | 203Pt | 33/2+# | ||||
204Pt | 78 | 126 | 203.98108(22)# | 10.3(14) s | β− | 204Au | 0+ | ||
204m1Pt | 1995.1(07) keV | 5.5(7) μs | IT | 204Pt | (5−) | ||||
204m2Pt | 2035(23) keV | 55(3) μs | IT | 204Pt | (7−) | ||||
204m3Pt | 3193(23) keV | 146(14) ns | IT | 204Pt | (10+) | ||||
205Pt | 78 | 127 | 204.98624(32)# | 2# s | β− ? | 205Au | 9/2+# | ||
206Pt | 78 | 128 | 205.99008(32)# | 500# ms | β− ? | 206Au | 0+ | ||
β−n ? | 205Au | ||||||||
207Pt | 78 | 129 | 206.99556(43)# | 600# ms | β− ? | 207Au | 9/2+# | ||
β−n ? | 206Au | ||||||||
208Pt | 78 | 130 | 207.99946(43)# | 220# ms | β− ? | 208Au | 0+ | ||
β−n ? | 207Au |
- ↑ mPt – Excited nuclear isomer.
- ↑ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
- ↑ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
- ↑ Bold half-life – nearly stable, half-life longer than age of universe.
- ↑
Modes of decay:
EC: Electron capture IT: Isomeric transition - ↑ Bold italics symbol as daughter – Daughter product is nearly stable.
- ↑ Bold symbol as daughter – Daughter product is stable.
- ↑ ( ) spin value – Indicates spin with weak assignment arguments.
- ↑ 9.0 9.1 # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
- ↑ Theorized to also undergo β+β+ decay to 190Os
- ↑ Believed to undergo α decay to 188Os with a half-life over 6.0×1016 years
- ↑ Believed to undergo α decay to 190Os
- ↑ Believed to undergo α decay to 191Os with a half-life over 6.3×1018 years
- ↑ Believed to undergo α decay to 192Os
- ↑ Believed to undergo α decay to 194Os or double β− decay to 198Hg with a half-life over 3.20×1014 years
References
- Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A 729: 3–128, doi:10.1016/j.nuclphysa.2003.11.001, Bibcode: 2003NuPhA.729....3A, https://hal.archives-ouvertes.fr/in2p3-00020241/document
- Isotopic compositions and standard atomic masses from:
- Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051.
- Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A 729: 3–128, doi:10.1016/j.nuclphysa.2003.11.001, Bibcode: 2003NuPhA.729....3A, https://hal.archives-ouvertes.fr/in2p3-00020241/document
- National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory. http://www.nndc.bnl.gov/nudat2/.
- Lide, David R., ed (2004). "11. Table of the Isotopes". CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.
![]() | Original source: https://en.wikipedia.org/wiki/Isotopes of platinum.
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