Isotopes of platinum

Naturally occurring platinum (₇₈Pt) consists of five stable isotopes (¹⁹²Pt, ¹⁹⁴Pt, ¹⁹⁵Pt, ¹⁹⁶Pt, ¹⁹⁸Pt) and one long-lived (half-life 4.83×10¹¹ years) radioisotope (¹⁹⁰Pt). There are also 34 known synthetic radioisotopes ranging from ¹⁶⁵Pt to ²⁰⁴Pt, and longest-lived of those is ¹⁹³Pt with a half-life of 50 years. All the others have half-lives under two weeks, most under a day. There are numerous metastable states, of which the most stable are ^193mPt and ^195mPt with half-lives 4.33 and 4.010 days, decaying to their ground states.

Despite the obstacles to measurement with rare isotopes of rare elements, with a very slow decay, the ¹⁹⁰Pt/¹⁸⁶Os system has been used in isotope geology, though not directly for dating.

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, making platinum one of the only three elements to have its most abundant isotope with an odd neutron number (the other two being beryllium and nitrogen); however, it is so only by a small margin, unlike the other two, and is more in the nature of a coincidence.

List of isotopes

|-id=Platinum-165 | ¹⁶⁵Pt | style="text-align:right" | 78 | style="text-align:right" | 87 | 164.99966(43)# | 370(180) ÃŽÂ¼s | α | ¹⁶¹Os | 7/2−# | | |-id=Platinum-166 | ¹⁶⁶Pt | style="text-align:right" | 78 | style="text-align:right" | 88 | 165.99487(32)# | 294(62) ÃŽÂ¼s | α | ¹⁶²Os | 0+ | | |-id=Platinum-167 | ¹⁶⁷Pt | style="text-align:right" | 78 | style="text-align:right" | 89 | 166.99275(33)# | 920(120) ÃŽÂ¼s | α | ¹⁶³Os | 7/2−# | | |-id=Platinum-168 | rowspan=2|¹⁶⁸Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 90 | rowspan=2|167.98818(16) | rowspan=2|2.02(10) ms | α | ¹⁶⁴Os | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺ ? | ¹⁶⁸Ir |-id=Platinum-169 | rowspan=2|¹⁶⁹Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 91 | rowspan=2|168.98662(22)# | rowspan=2|6.99(9) ms | α | ¹⁶⁵Os | rowspan=2|(7/2−) | rowspan=2| | rowspan=2| |- | β⁺ ? | ¹⁶⁹Ir |-id=Platinum-170 | rowspan=2|¹⁷⁰Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 92 | rowspan=2|169.982502(20) | rowspan=2|13.93(16) ms | α | ¹⁶⁶Os | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺ ? | ¹⁷⁰Ir |-id=Platinum-171 | rowspan=2|¹⁷¹Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 93 | rowspan=2|170.981249(87) | rowspan=2|45.5(25) ms | α (86%) | ¹⁶⁷Os | rowspan=2|7/2− | rowspan=2| | rowspan=2| |- | β⁺ (14%) | ¹⁷¹Ir |-id=Platinum-171m | style="text-indent:1em" | ^171mPt | colspan=3 style="text-indent:2em" | 412.6(10) keV | 901(9) ns | IT | ¹⁷¹Pt | 13/2+ | | |-id=Platinum-172 | rowspan=2|¹⁷²Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 94 | rowspan=2|171.977341(11) | rowspan=2|97.6(13) ms | α (96%) | ¹⁶⁸Os | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺ (4%) | ¹⁷²Ir |-id=Platinum-173 | rowspan=2|¹⁷³Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 95 | rowspan=2|172.976450(68) | rowspan=2|382(2) ms | α (86%) | ¹⁶⁹Os | rowspan=2|(5/2−) | rowspan=2| | rowspan=2| |- | β⁺ (14%) | ¹⁷³Ir |-id=Platinum-174 | rowspan=2|¹⁷⁴Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 96 | rowspan=2|173.972820(11) | rowspan=2|862(8) ms | α (74.9%) | ¹⁷⁰Os | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺ (25.1%) | ¹⁷⁴Ir |-id=Platinum-175 | rowspan=2|¹⁷⁵Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 97 | rowspan=2|174.972401(20) | rowspan=2|2.43(4) s | α (64%) | ¹⁷¹Os | rowspan=2|(7/2−) | rowspan=2| | rowspan=2| |- | β⁺ (36%) | ¹⁷⁵Ir |-id=Platinum-176 | rowspan=2|¹⁷⁶Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 98 | rowspan=2|175.968938(14) | rowspan=2|6.33(15) s | β⁺ (60%) | ¹⁷⁶Ir | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (40%) | ¹⁷²Os |-id=Platinum-177 | rowspan=2|¹⁷⁷Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 99 | rowspan=2|176.968470(16) | rowspan=2|10.0(04) s | β⁺ (94.3%) | ¹⁷⁷Ir | rowspan=2|5/2− | rowspan=2| | rowspan=2| |- | α (5.7%) | ¹⁷³Os |-id=Platinum-177m | style="text-indent:1em" | ^177mPt | colspan=3 style="text-indent:2em" | 147.5(4) keV | 2.35(4) ÃŽÂ¼s | IT | ¹⁷⁷Pt | 1/2− | | |-id=Platinum-178 | rowspan=2|¹⁷⁸Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 100 | rowspan=2|177.965649(11) | rowspan=2|20.7(7) s | β⁺ (92.3%) | ¹⁷⁸Ir | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (7.7%) | ¹⁷⁴Os |-id=Platinum-179 | rowspan=2|¹⁷⁹Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 101 | rowspan=2|178.9653588(86) | rowspan=2|21.2(4) s | β⁺ (99.76%) | ¹⁷⁹Ir | rowspan=2|1/2− | rowspan=2| | rowspan=2| |- | α (0.24%) | ¹⁷⁵Os |-id=Platinum-180 | rowspan=2|¹⁸⁰Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 102 | rowspan=2|179.963038(11) | rowspan=2|56(3) s | β⁺ (99.48%) | ¹⁸⁰Ir | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (0.52%) | ¹⁷⁶Os |-id=Platinum-181 | rowspan=2|¹⁸¹Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 103 | rowspan=2|180.963090(15) | rowspan=2|52.0(22) s | β⁺ (99.93%) | ¹⁸¹Ir | rowspan=2|1/2− | rowspan=2| | rowspan=2| |- | α (0.074%) | ¹⁷⁷Os |-id=Platinum-181m | style="text-indent:1em" | ^181mPt | colspan=3 style="text-indent:2em" | 116.65(8) keV | >300 ns | IT | ¹⁸¹Pt | 7/2− | | |-id=Platinum-182 | rowspan=2|¹⁸²Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 104 | rowspan=2|181.961172(14) | rowspan=2|2.67(12) min | β⁺ (99.962%) | ¹⁸²Ir | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (0.038%) | ¹⁷⁸Os |-id=Platinum-183 | rowspan=2|¹⁸³Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 105 | rowspan=2|182.961596(15) | rowspan=2|6.5(10) min | β⁺ (99.99%) | ¹⁸³Ir | rowspan=2|1/2− | rowspan=2| | rowspan=2| |- | α (0.0096%) | ¹⁷⁹Os |-id=Platinum-183m1 | rowspan=3 style="text-indent:1em" | ^183m1Pt | rowspan=3 colspan=3 style="text-indent:2em" | 34.74(7) keV | rowspan=3|43(5) s | β⁺ (96.9%) | ¹⁸³Ir | rowspan=3|7/2− | rowspan=3| | rowspan=3| |- | IT (3.1%) | ¹⁸³Pt |- | α ? | ¹⁷⁹Os |-id=Platinum-183m2 | style="text-indent:1em" | ^183m2Pt | colspan=3 style="text-indent:2em" | 195.90(10) keV | >150 ns | IT | ¹⁸³Pt | 9/2+ | | |-id=Platinum-184 | rowspan=2|¹⁸⁴Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 106 | rowspan=2|183.959922(16) | rowspan=2|17.3(2) min | β⁺ | ¹⁸⁴Ir | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (0.0017%) | ¹⁸⁰Os |-id=Platinum-184m | style="text-indent:1em" | ^184mPt | colspan=3 style="text-indent:2em" | 1840.3(8) keV | 1.01(5) ms | IT | ¹⁸⁴Pt | 8− | | |-id=Platinum-185 | rowspan=2|¹⁸⁵Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 107 | rowspan=2|184.960614(28) | rowspan=2|70.9(24) min | β⁺ | ¹⁸⁵Ir | rowspan=2|9/2+ | rowspan=2| | rowspan=2| |- | α (0.0050%) | ¹⁸¹Os |-id=Platinum-185m1 | style="text-indent:1em" | ^185m1Pt | colspan=3 style="text-indent:2em" | 103.41(5) keV | 33.0(8) min | β⁺ | ¹⁸⁵Ir | 1/2− | | |-id=Platinum-185m2 | style="text-indent:1em" | ^185m2Pt | colspan=3 style="text-indent:2em" | 200.89(4) keV | 728(20) ns | IT | ¹⁸⁵Pt | 5/2− | | |-id=Platinum-186 | 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⁺ | ¹⁸⁶Ir | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (1.4×10^{−4}%) | ¹⁸²Os |-id=Platinum-187 | ¹⁸⁷Pt | style="text-align:right" | 78 | style="text-align:right" | 109 | 186.960617(26) | 2.35(3) h | β⁺ | ¹⁸⁷Ir | 3/2− | | |-id=Platinum-187m | style="text-indent:1em" | ^187mPt | colspan=3 style="text-indent:2em" | 174.38(22) keV | 311(15) ÃŽÂ¼s | IT | ¹⁸⁷Pt | 11/2+ | | |-id=Platinum-188 | rowspan=2|¹⁸⁸Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 110 | rowspan=2|187.9593975(57) | rowspan=2|10.16(18) d | EC | ¹⁸⁸Ir | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (2.6×10^{−5}%) | ¹⁸⁴Os |-id=Platinum-189 | ¹⁸⁹Pt | style="text-align:right" | 78 | style="text-align:right" | 111 | 188.960848(11) | 10.87(12) h | β⁺ | ¹⁸⁹Ir | 3/2− | | |-id=Platinum-189m1 | style="text-indent:1em" | ^189m1Pt | colspan=3 style="text-indent:2em" | 172.79(6) keV | 464(25) ns | IT | ¹⁸⁹Pt | 9/2− | | |-id=Platinum-189m2 | style="text-indent:1em" | ^189m2Pt | colspan=3 style="text-indent:2em" | 191.6(4) keV | 143(5) ÃŽÂ¼s | IT | ¹⁸⁹Pt | (13/2+) | | |-id=Platinum-190 | ¹⁹⁰Pt | style="text-align:right" | 78 | style="text-align:right" | 112 | 189.95994982(71) | 4.83(3)×10¹¹ y | α | ¹⁸⁶Os | 0+ | 1.2(2)×10^{−4} | |-id=Platinum-191 | ¹⁹¹Pt | style="text-align:right" | 78 | style="text-align:right" | 113 | 190.9616763(44) | 2.83(2) d | EC | ¹⁹¹Ir | 3/2− | | |-id=Platinum-191m1 | style="text-indent:1em" | ^191m1Pt | colspan=3 style="text-indent:2em" | 100.663(20) keV | >1 ÃŽÂ¼s | IT | ¹⁹¹Pt | 9/2− | | |-id=Platinum-191m2 | style="text-indent:1em" | ^191m2Pt | colspan=3 style="text-indent:2em" | 149.035(22) keV | 95(5) ÃŽÂ¼s | IT | ¹⁹¹Pt | 13/2+ | | |-id=Platinum-192 | ¹⁹²Pt | style="text-align:right" | 78 | style="text-align:right" | 114 | 191.9610427(28) | colspan=3 align=center|Observationally Stable | 0+ | 0.00782(24) | |-id=Platinum-192m | style="text-indent:1em" | ^192mPt | colspan=3 style="text-indent:2em" | 2172.37(13) keV | 272(23) ns | IT | ¹⁹²Pt | 10− | | |-id=Platinum-193 | ¹⁹³Pt | style="text-align:right" | 78 | style="text-align:right" | 115 | 192.9629845(15) | 50(6) y | EC | ¹⁹³Ir | 1/2− | | |-id=Platinum-193m | style="text-indent:1em" | ^193mPt | colspan=3 style="text-indent:2em" | 149.78(4) keV | 4.33(3) d | IT | ¹⁹³Pt | 13/2+ | | |-id=Platinum-194 | ¹⁹⁴Pt | style="text-align:right" | 78 | style="text-align:right" | 116 | 193.96268350(53) | colspan=3 align=center|Observationally Stable | 0+ | 0.3286(41) | |-id=Platinum-195 | ¹⁹⁵Pt | style="text-align:right" | 78 | style="text-align:right" | 117 | 194.96479433(54) | colspan=3 align=center|Observationally Stable | 1/2− | 0.3378(24) | |-id=Platinum-195m | style="text-indent:1em" | ^195mPt | colspan=3 style="text-indent:2em" | 259.077(23) keV | 4.010(5) d | IT | ¹⁹⁵Pt | 13/2+ | | |-id=Platinum-196 | ¹⁹⁶Pt | style="text-align:right" | 78 | style="text-align:right" | 118 | 195.96495465(55) | colspan=3 align=center|Observationally Stable | 0+ | 0.2521(34) | |-id=Platinum-197 | ¹⁹⁷Pt | style="text-align:right" | 78 | style="text-align:right" | 119 | 196.96734303(58) | 19.8915(19) h | β^− | ¹⁹⁷Au | 1/2− | | |-id=Platinum-197m | 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 |-id=Platinum-198 | ¹⁹⁸Pt | style="text-align:right" | 78 | style="text-align:right" | 120 | 197.9678967(23) | colspan=3 align=center|Observationally Stable | 0+ | 0.0734(13) | |-id=Platinum-199 | ¹⁹⁹Pt | style="text-align:right" | 78 | style="text-align:right" | 121 | 198.9705970(23) | 30.80(21) min | β^− | ¹⁹⁹Au | 5/2− | | |-id=Platinum-199m | style="text-indent:1em" | ^199mPt | colspan=3 style="text-indent:2em" | 424(2) keV | 13.48(16) s | IT | ¹⁹⁹Pt | 13/2+ | | |-id=Platinum-200 | ²⁰⁰Pt | style="text-align:right" | 78 | style="text-align:right" | 122 | 199.971445(22) | 12.6(3) h | β^− | ²⁰⁰Au | 0+ | | |-id=Platinum-201 | ²⁰¹Pt | style="text-align:right" | 78 | style="text-align:right" | 123 | 200.974513(54) | 2.5(1) min | β^− | ²⁰¹Au | (5/2−) | | |-id=Platinum-202 | ²⁰²Pt | style="text-align:right" | 78 | style="text-align:right" | 124 | 201.975639(27) | 44(15) h | β^− | ²⁰²Au | 0+ | | |-id=Platinum-202m | style="text-indent:1em" | ^202mPt | colspan=3 style="text-indent:2em" | 1788.5(4) keV | 141(7) ÃŽÂ¼s | IT | ²⁰²Pt | (7−) | | |-id=Platinum-203 | ²⁰³Pt | style="text-align:right" | 78 | style="text-align:right" | 125 | 202.97906(22)# | 22(4) s | β^− | ²⁰³Au | (1/2−) | | |-id=Platinum-203m1 | rowspan=2 style="text-indent:1em" | ^203m1Pt | rowspan=2 colspan=3 style="text-indent:2em" | 1367(3)# keV | rowspan=2 | 12(5) s | β^− | ²⁰³Au | rowspan=2 | 13/2+# | rowspan=2 | | rowspan=2 | |- | IT ? | ²⁰³Pt |-id=Platinum-203m2 | style="text-indent:1em" | ^203m2Pt | colspan=3 style="text-indent:2em" | 1420(50)# keV | >100# ns | IT | ²⁰³Pt | 27/2−# | | |-id=Platinum-203m3 | style="text-indent:1em" | ^203m3Pt | colspan=3 style="text-indent:2em" | 2530(50)# keV | 641(55) ns | IT | ²⁰³Pt | 33/2+# | | |-id=Platinum-204 | ²⁰⁴Pt | style="text-align:right" | 78 | style="text-align:right" | 126 | 203.98108(22)# | 10.3(14) s | β^− | ²⁰⁴Au | 0+ | | |-id=Platinum-204m1 | style="text-indent:1em" | ^204m1Pt | colspan=3 style="text-indent:2em" | 1995.1(07) keV | 5.5(7) ÃŽÂ¼s | IT | ²⁰⁴Pt | (5−) | | |-id=Platinum-204m2 | style="text-indent:1em" | ^204m2Pt | colspan=3 style="text-indent:2em" | 2035(23) keV | 55(3) ÃŽÂ¼s | IT | ²⁰⁴Pt | (7−) | | |-id=Platinum-204m3 | style="text-indent:1em" | ^204m3Pt | colspan=3 style="text-indent:2em" | 3193(23) keV | 146(14) ns | IT | ²⁰⁴Pt | (10+) | | |-id=Platinum-205 | ²⁰⁵Pt | style="text-align:right" | 78 | style="text-align:right" | 127 | 204.98624(32)# | 2# s | β^− ? | ²⁰⁵Au | 9/2+# | | |-id=Platinum-206 | rowspan=2 | ²⁰⁶Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 128 | rowspan=2 | 205.99008(32)# | rowspan=2 | 500# ms | β^− ? | ²⁰⁶Au | rowspan=2 | 0+ | rowspan=2 | | rowspan=2 | |- | β^−n ? | ²⁰⁵Au |-id=Platinum-207 | rowspan=2 | ²⁰⁷Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 129 | rowspan=2 | 206.99556(43)# | rowspan=2 | 600# ms | β^− ? | ²⁰⁷Au | rowspan=2 | 9/2+# | rowspan=2 | | rowspan=2 | |- | β^−n ? | ²⁰⁶Au |-id=Platinum-208 | rowspan=2 | ²⁰⁸Pt | rowspan=2 style="text-align:right" | 78 | rowspan=2 style="text-align:right" | 130 | rowspan=2 | 207.99946(43)# | rowspan=2 | 220# ms | β^− ? | ²⁰⁸Au | rowspan=2 | 0+ | rowspan=2 | | rowspan=2 | |- | β^−n ? | ²⁰⁷Au

See also

Daughter products other than platinum

• Isotopes of gold
• Isotopes of iridium
• Isotopes of osmium

References

• Isotope masses from:
• Isotopic compositions and standard atomic masses from:
• Half-life, spin, and isomer data selected from the following sources.