Isotopes of platinum

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Natural platinum (Pt) occurs in five stable isotopes (192Pt, 194Pt, 195Pt, 196Pt, 198Pt) and one very-long lived (half-life 6.50×1011 years) radioisotope (190Pt). There are also 31 known artificial 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.

Standard atomic mass: 195.084(9) u

Table[edit]

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life[n 1] decay
mode(s)[1][n 2]
daughter
isotope(s)[n 3]
nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
166Pt 78 88 165.99486(54)# 300(100) µs 0+
167Pt 78 89 166.99298(44)# 700(200) µs 7/2-#
168Pt 78 90 167.98815(22) 2.00(18) ms α 164Os 0+
β+ (rare) 168Ir
169Pt 78 91 168.98672(22)# 3.7(15) ms α 165Os 3/2-#
β+ (rare) 169Ir
170Pt 78 92 169.982495(20) 14.0(2) ms α (98%) 166Os 0+
β+ (2%) 170Ir
171Pt 78 93 170.98124(9) 51(2) ms α (99%) 167Os 3/2-#
β+ (1%) 171Ir
172Pt 78 94 171.977347(14) 98.4(24) ms α (77%) 168Os 0+
β+ (23%) 172Ir
173Pt 78 95 172.97644(6) 365(7) ms α (84%) 169Os 5/2-#
β+ (16%) 173Ir
174Pt 78 96 173.972819(13) 0.889(17) s α (83%) 170Os 0+
β+ (17%) 174Ir
175Pt 78 97 174.972421(20) 2.53(6) s α (64%) 171Os 5/2-#
β+ (36%) 175Ir
176Pt 78 98 175.968945(15) 6.33(15) s β+ (62%) 176Ir 0+
α (38%) 172Os
177Pt 78 99 176.968469(16) 10.6(4) s β+ (94.4%) 177Ir 5/2-
α (5.6%) 173Os
177mPt 147.4(4) keV 2.2(3) µs 1/2-
178Pt 78 100 177.965649(12) 21.1(6) s β+ (92.3%) 178Ir 0+
α (7.7%) 174Os
179Pt 78 101 178.965363(10) 21.2(4) s β+ (99.76%) 179Ir 1/2-
α (0.24%) 175Os
180Pt 78 102 179.963031(12) 56(2) s β+ (99.7%) 180Ir 0+
α (0.3%) 176Os
181Pt 78 103 180.963097(16) 52.0(22) s β+ (99.93%) 181Ir 1/2-
α (0.074%) 177Os
182Pt 78 104 181.961171(17) 2.2(1) min β+ (99.96%) 182Ir 0+
α (.038%) 178Os
183Pt 78 105 182.961597(17) 6.5(10) min β+ (99.99%) 183Ir 1/2-
α (.0096%) 179Os
183m1Pt 34.50(8) keV 43(5) s β+ (99.99%) 183Ir (7/2)-
α (4×10−4%) 179Os
IT 183Pt
183m2Pt 195.68(11) keV >150 ns (9/2)+
184Pt 78 106 183.959922(19) 17.3(2) min β+ (99.99%) 184Ir 0+
α (.00169%) 180Os
184mPt 1839.4(16) keV 1.01(5) ms IT 184Pt 8-
185Pt 78 107 184.96062(4) 70.9(24) min β+ (99.99%) 185Ir (9/2+)
α (.005%) 181Os
185mPt 103.4(2) keV 33.0(8) min β+ (98%) 185Ir (1/2-)
α (2%) 181Os
186Pt 78 108 185.959351(23) 2.08(5) h β+ (99.99%) 186Ir 0+
α (1.4×10−4%) 182Os
187Pt 78 109 186.96059(3) 2.35(3) h β+ 187Ir 3/2-
188Pt 78 110 187.959395(6) 10.2(3) d EC (99.99%) 188Ir 0+
α (2.6×10−5%) 184Os
189Pt 78 111 188.960834(12) 10.87(12) h β+ 189Ir 3/2-
189m1Pt 172.80(6) keV 464(25) ns 9/2-
189m2Pt 191.6(4) keV 143(5) µs (13/2+)
190Pt 78 112 189.959932(6) 6.5(3)×1011 a α 186Os 0+ 1.4(1)×10−4
191Pt 78 113 190.961677(5) 2.862(7) d EC 191Ir 3/2-
191m1Pt 100.67(2) keV >1 µs (9/2)-
191m2Pt 149.04(2) keV 95(5) µs (13/2)+
192Pt 78 114 191.9610380(27) Observationally Stable[n 4] 0+ 0.00782(7)
193Pt 78 115 192.9629874(18) 50(6) a EC 193Ir 1/2-
193mPt 149.78(4) keV 4.33(3) d IT 193Pt 13/2+
194Pt 78 116 193.9626803(9) Observationally Stable[n 5] 0+ 0.32967(99)
195Pt 78 117 194.9647911(9) Observationally Stable[n 6] 1/2- 0.33832(10)
195mPt 259.30(8) keV 4.010(5) d IT 195Pt 13/2+
196Pt 78 118 195.9649515(9) Observationally Stable[n 7] 0+ 0.25242(41)
197Pt 78 119 196.9673402(9) 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 78 120 197.967893(3) Observationally Stable[n 8] 0+ 0.07163(55)
199Pt 78 121 198.970593(3) 30.80(21) min β- 199Au 5/2-
199mPt 424(2) keV 13.6(4) s IT 199Pt (13/2)+
200Pt 78 122 199.971441(22) 12.5(3) h β- 200Au 0+
201Pt 78 123 200.97451(5) 2.5(1) min β- 201Au (5/2-)
202Pt 78 124 201.97574(32)# 44(15) h β- 202Au 0+
  1. ^ Bold for isotopes with half-lives longer than the age of the universe (nearly stable)
  2. ^ Abbreviations:
    EC: Electron capture
    IT: Isomeric transition
  3. ^ Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)
  4. ^ Believed to undergo α decay to 188Os with a half-life over 470×1015 years
  5. ^ Believed to undergo α decay to 190Os
  6. ^ Believed to undergo α decay to 191Os
  7. ^ Believed to undergo α decay to 192Os
  8. ^ Believed to undergo α decay to 194Os or double β- decay to 198Hg with a half-life over 320×1012 years

Notes[edit]

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References[edit]

  1. ^ http://www.nucleonica.net/unc.aspx


Isotopes of iridium Isotopes of platinum Isotopes of gold
Table of nuclides