Naturally occurring

platinum Platinum is a chemical element with the symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish , a diminutive of "silver". Platinu ...

(₇₈Pt) consists of five

stable A stable is a building in which livestock, especially horses, are kept. It most commonly means a building that is divided into separate stalls for individual animals and livestock. There are many different types of stables in use today; the ...

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 numbers) ...

s (¹⁹²Pt, ¹⁹⁴Pt, ¹⁹⁵Pt, ¹⁹⁶Pt, ¹⁹⁸Pt) and one very long-lived (

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 ato ...

6.50×10¹¹ years)

radioisotope A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is a nuclide that has excess nuclear energy, making it unstable. This excess energy can be used in one of three ways: emitted from the nucleus as gamma radiation; transferr ...

(¹⁹⁰Pt). There are also 34 known

synthetic radioisotope A synthetic radioisotope is a radionuclide that is not found in nature: no natural process or mechanism exists which produces it, or it is so unstable that it decays away in a very short period of time. Examples include technetium-95 and prometh ...

s, 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 platinium are either radioactive or

observationally stable Stable nuclides are nuclides that are not radioactive and so (unlike radionuclides) do not spontaneously undergo radioactive decay. When such nuclides are referred to in relation to specific elements, they are usually termed stable isotopes. Th ...

, meaning that they are predicted to be radioactive but no actual decay has been observed.

List of isotopes

, - , ¹⁶⁵Pt , style="text-align:right" , 78 , style="text-align:right" , 87 , , 260(+260-90) μs , α , ¹⁶¹Os , , , , - , ¹⁶⁶Pt , style="text-align:right" , 78 , style="text-align:right" , 88 , 165.99486(54)# , 260(+300-60) μs , α , ¹⁶²Os , 0+ , , , - , ¹⁶⁷Pt , style="text-align:right" , 78 , style="text-align:right" , 89 , 166.99298(44)# , 1.1(2) ms , α , ¹⁶³Os , 7/2−# , , , - , rowspan=2, ¹⁶⁸Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 90 , rowspan=2, 167.98815(22) , rowspan=2, 2.00(18) ms , α , ¹⁶⁴Os , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , β⁺ (rare) , ¹⁶⁸Ir , - , rowspan=2, ¹⁶⁹Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 91 , rowspan=2, 168.98672(22)# , rowspan=2, 3.7(15) ms , α , ¹⁶⁵Os , rowspan=2, 3/2−# , rowspan=2, , rowspan=2, , - , β⁺ (rare) , ¹⁶⁹Ir , - , rowspan=2, ¹⁷⁰Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 92 , rowspan=2, 169.982495(20) , rowspan=2, 14.0(2) ms , α (98%) , ¹⁶⁶Os , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , β⁺ (2%) , ¹⁷⁰Ir , - , rowspan=2, ¹⁷¹Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 93 , rowspan=2, 170.98124(9) , rowspan=2, 51(2) ms , α (99%) , ¹⁶⁷Os , rowspan=2, 3/2−# , rowspan=2, , rowspan=2, , - , β⁺ (1%) , ¹⁷¹Ir , - , rowspan=2, ¹⁷²Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 94 , rowspan=2, 171.977347(14) , rowspan=2, 98.4(24) ms , α (77%) , ¹⁶⁸Os , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , β⁺ (23%) , ¹⁷²Ir , - , rowspan=2, ¹⁷³Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 95 , rowspan=2, 172.97644(6) , rowspan=2, 365(7) ms , α (84%) , ¹⁶⁹Os , rowspan=2, 5/2−# , rowspan=2, , rowspan=2, , - , β⁺ (16%) , ¹⁷³Ir , - , rowspan=2, ¹⁷⁴Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 96 , rowspan=2, 173.972819(13) , rowspan=2, 0.889(17) s , α (83%) , ¹⁷⁰Os , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , β⁺ (17%) , ¹⁷⁴Ir , - , rowspan=2, ¹⁷⁵Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 97 , rowspan=2, 174.972421(20) , rowspan=2, 2.53(6) s , α (64%) , ¹⁷¹Os , rowspan=2, 5/2−# , rowspan=2, , rowspan=2, , - , β⁺ (36%) , ¹⁷⁵Ir , - , rowspan=2, ¹⁷⁶Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 98 , rowspan=2, 175.968945(15) , rowspan=2, 6.33(15) s , β⁺ (62%) , ¹⁷⁶Ir , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , α (38%) , ¹⁷²Os , - , rowspan=2, ¹⁷⁷Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 99 , rowspan=2, 176.968469(16) , rowspan=2, 10.6(4) s , β⁺ (94.4%) , ¹⁷⁷Ir , rowspan=2, 5/2− , rowspan=2, , rowspan=2, , - , α (5.6%) , ¹⁷³Os , - , style="text-indent:1em" , ^177mPt , colspan="3" style="text-indent:2em" , 147.4(4) keV , 2.2(3) μs , , , 1/2− , , , - , rowspan=2, ¹⁷⁸Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 100 , rowspan=2, 177.965649(12) , rowspan=2, 21.1(6) s , β⁺ (92.3%) , ¹⁷⁸Ir , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , α (7.7%) , ¹⁷⁴Os , - , rowspan=2, ¹⁷⁹Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 101 , rowspan=2, 178.965363(10) , rowspan=2, 21.2(4) s , β⁺ (99.76%) , ¹⁷⁹Ir , rowspan=2, 1/2− , rowspan=2, , rowspan=2, , - , α (0.24%) , ¹⁷⁵Os , - , rowspan=2, ¹⁸⁰Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 102 , rowspan=2, 179.963031(12) , rowspan=2, 56(2) s , β⁺ (99.7%) , ¹⁸⁰Ir , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , α (0.3%) , ¹⁷⁶Os , - , rowspan=2, ¹⁸¹Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 103 , rowspan=2, 180.963097(16) , rowspan=2, 52.0(22) s , β⁺ (99.93%) , ¹⁸¹Ir , rowspan=2, 1/2− , rowspan=2, , rowspan=2, , - , α (0.074%) , ¹⁷⁷Os , - , rowspan=2, ¹⁸²Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 104 , rowspan=2, 181.961171(17) , rowspan=2, 2.2(1) min , β⁺ (99.96%) , ¹⁸²Ir , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , α (.038%) , ¹⁷⁸Os , - , rowspan=2, ¹⁸³Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 105 , rowspan=2, 182.961597(17) , rowspan=2, 6.5(10) min , β⁺ (99.99%) , ¹⁸³Ir , rowspan=2, 1/2− , rowspan=2, , rowspan=2, , - , α (.0096%) , ¹⁷⁹Os , - , rowspan=3 style="text-indent:1em" , ^183m1Pt , rowspan=3 colspan="3" style="text-indent:2em" , 34.50(8) keV , rowspan=3, 43(5) s , β⁺ (99.99%) , ¹⁸³Ir , rowspan=3, (7/2)− , rowspan=3, , rowspan=3, , - , α (4×10⁻⁴%) , ¹⁷⁹Os , - , IT , ¹⁸³Pt , - , style="text-indent:1em" , ^183m2Pt , colspan="3" style="text-indent:2em" , 195.68(11) keV , >150 ns , , , (9/2)+ , , , - , rowspan=2, ¹⁸⁴Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 106 , rowspan=2, 183.959922(19) , rowspan=2, 17.3(2) min , β⁺ (99.99%) , ¹⁸⁴Ir , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , α (.00169%) , ¹⁸⁰Os , - , style="text-indent:1em" , ^184mPt , colspan="3" style="text-indent:2em" , 1839.4(16) keV , 1.01(5) ms , IT , ¹⁸⁴Pt , 8− , , , - , rowspan=2, ¹⁸⁵Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 107 , rowspan=2, 184.96062(4) , rowspan=2, 70.9(24) min , β⁺ (99.99%) , ¹⁸⁵Ir , rowspan=2, (9/2+) , rowspan=2, , rowspan=2, , - , α (.005%) , ¹⁸¹Os , - , rowspan=2 style="text-indent:1em" , ^185mPt , rowspan=2 colspan="3" style="text-indent:2em" , 103.4(2) keV , rowspan=2, 33.0(8) min , β⁺ (98%) , ¹⁸⁵Ir , rowspan=2, (1/2−) , rowspan=2, , rowspan=2, , - , α (2%) , ¹⁸¹Os , - , rowspan=2, ¹⁸⁶Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 108 , rowspan=2, 185.959351(23) , rowspan=2, 2.08(5) h , β⁺ (99.99%) , ¹⁸⁶Ir , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , α (1.4×10⁻⁴%) , ¹⁸²Os , - , ¹⁸⁷Pt , style="text-align:right" , 78 , style="text-align:right" , 109 , 186.96059(3) , 2.35(3) h , β⁺ , ¹⁸⁷Ir , 3/2− , , , - , rowspan=2, ¹⁸⁸Pt , rowspan=2 style="text-align:right" , 78 , rowspan=2 style="text-align:right" , 110 , rowspan=2, 187.959395(6) , rowspan=2, 10.2(3) d , EC (99.99%) , ¹⁸⁸Ir , rowspan=2, 0+ , rowspan=2, , rowspan=2, , - , α (2.6×10⁻⁵%) , ''¹⁸⁴Os'' , - , ¹⁸⁹Pt , style="text-align:right" , 78 , style="text-align:right" , 111 , 188.960834(12) , 10.87(12) h , β⁺ , ¹⁸⁹Ir , 3/2− , , , - , style="text-indent:1em" , ^189m1Pt , colspan="3" style="text-indent:2em" , 172.80(6) keV , 464(25) ns , , , 9/2− , , , - , style="text-indent:1em" , ^189m2Pt , colspan="3" style="text-indent:2em" , 191.6(4) keV , 143(5) μs , , , (13/2+) , , , - , ¹⁹⁰Pt , style="text-align:right" , 78 , style="text-align:right" , 112 , 189.959932(6) , 6.5(3)×10¹¹ y , α , ''¹⁸⁶Os'' , 0+ , 1.4(1)×10⁻⁴ , , - , ¹⁹¹Pt , style="text-align:right" , 78 , style="text-align:right" , 113 , 190.961677(5) , 2.862(7) d , EC , ¹⁹¹Ir , 3/2− , , , - , style="text-indent:1em" , ^191m1Pt , colspan="3" style="text-indent:2em" , 100.67(2) keV , >1 μs , , , (9/2)− , , , - , style="text-indent:1em" , ^191m2Pt , colspan="3" style="text-indent:2em" , 149.04(2) keV , 95(5) μs , , , (13/2)+ , , , - , ¹⁹²Pt , style="text-align:right" , 78 , style="text-align:right" , 114 , 191.9610380(27) , colspan=3 align=center,

Observationally Stable Stable nuclides are nuclides that are not radioactive and so (unlike radionuclides) do not spontaneously undergo radioactive decay. When such nuclides are referred to in relation to specific elements, they are usually termed stable isotopes. Th ...

Believed to undergo α decay to ¹⁸⁸Os with a half-life over 60×10¹⁵ years , 0+ , 0.00782(7) , , - , ¹⁹³Pt , style="text-align:right" , 78 , style="text-align:right" , 115 , 192.9629874(18) , 50(6) y , EC , ¹⁹³Ir , 1/2− , , , - , style="text-indent:1em" , ^193mPt , colspan="3" style="text-indent:2em" , 149.78(4) keV , 4.33(3) d , IT , ¹⁹³Pt , 13/2+ , , , - , ¹⁹⁴Pt , style="text-align:right" , 78 , style="text-align:right" , 116 , 193.9626803(9) , colspan=3 align=center, Observationally StableBelieved to undergo α decay to ¹⁹⁰Os , 0+ , 0.32967(99) , , - , ¹⁹⁵Pt , style="text-align:right" , 78 , style="text-align:right" , 117 , 194.9647911(9) , colspan=3 align=center, Observationally StableBelieved to undergo α decay to ¹⁹¹OsCan undergo bound-state β⁻ decay to ¹⁹⁵Au , 1/2− , 0.33832(10) , , - , style="text-indent:1em" , ^195mPt , colspan="3" style="text-indent:2em" , 259.30(8) keV , 4.010(5) d , IT , ¹⁹⁵Pt , 13/2+ , , , - , ¹⁹⁶Pt , style="text-align:right" , 78 , style="text-align:right" , 118 , 195.9649515(9) , colspan=3 align=center, Observationally StableBelieved to undergo α decay to ¹⁹²Os , 0+ , 0.25242(41) , , - , ¹⁹⁷Pt , style="text-align:right" , 78 , style="text-align:right" , 119 , 196.9673402(9) , 19.8915(19) h , β⁻ , ¹⁹⁷Au , 1/2− , , , - , rowspan=2 style="text-indent:1em" , ^197mPt , rowspan=2 colspan="3" style="text-indent:2em" , 399.59(20) keV , rowspan=2, 95.41(18) min , IT (96.7%) , ¹⁹⁷Pt , rowspan=2, 13/2+ , rowspan=2, , rowspan=2, , - , β⁻ (3.3%) , ¹⁹⁷Au , - , ¹⁹⁸Pt , style="text-align:right" , 78 , style="text-align:right" , 120 , 197.967893(3) , colspan=3 align=center, Observationally StableBelieved to undergo double β⁻ decay to ¹⁹⁸Hg with a half-life over 320×10¹² years , 0+ , 0.07163(55) , , - , ¹⁹⁹Pt , style="text-align:right" , 78 , style="text-align:right" , 121 , 198.970593(3) , 30.80(21) min , β⁻ , ¹⁹⁹Au , 5/2− , , , - , style="text-indent:1em" , ^199mPt , colspan="3" style="text-indent:2em" , 424(2) keV , 13.6(4) s , IT , ¹⁹⁹Pt , (13/2)+ , , , - , ²⁰⁰Pt , style="text-align:right" , 78 , style="text-align:right" , 122 , 199.971441(22) , 12.5(3) h , β⁻ , ²⁰⁰Au , 0+ , , , - , ²⁰¹Pt , style="text-align:right" , 78 , style="text-align:right" , 123 , 200.97451(5) , 2.5(1) min , β⁻ , ²⁰¹Au , (5/2−) , , , - , ²⁰²Pt , style="text-align:right" , 78 , style="text-align:right" , 124 , 201.97574(32) , 44(15) h , β⁻ , ²⁰²Au , 0+ , , , - , style="text-indent:1em" , ^202mPt , colspan="3" style="text-indent:2em" , 1788.5(0.4) keV , 141(7) μs , IT , ²⁰²Pt , (7-) , , , - , ²⁰³Pt , style="text-align:right" , 78 , style="text-align:right" , 125 , 202.97893(200)# , 22(4) s , β⁻ , ²⁰³Au , (1/2-) , , , - , style="text-indent:1em" , ^203mPt , colspan="3" style="text-indent:2em" , 3100# keV , 641(55) μs , IT , ²⁰³Pt , 33/2+# , , , - , ²⁰⁴Pt , style="text-align:right" , 78 , style="text-align:right" , 126 , 203.98076(200)# , 10.3(14) s , β⁻ , ²⁰⁴Au , 0+ , , , - , style="text-indent:1em" , ^204m1Pt , colspan="3" style="text-indent:2em" , 1995.1(0.7) keV , 5.5(7) μs , IT , ²⁰⁴Pt , (5-) , , , - , style="text-indent:1em" , ^204m2Pt , colspan="3" style="text-indent:2em" , 2035(23) keV , 55(3) μs , IT , ²⁰⁴Pt , (7-) , , , - , style="text-indent:1em" , ^204m3Pt , colspan="3" style="text-indent:2em" , 3193(23) keV , 146(14) ns , IT , ²⁰⁴Pt , (10+) , ,

References

* Isotope masses from: ** * Isotopic compositions and standard atomic masses from: ** ** * Half-life, spin, and isomer data selected from the following sources. ** ** ** {{Navbox element isotopes Platinum

Platinum Platinum is a chemical element with the symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish , a diminutive of "silver". Platinu ...