Isotopes of platinum explained

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

|-| ¹⁶⁵Pt| style="text-align:right" | 78| style="text-align:right" | 87| 164.99966(43)#| 370(180) μs| α| ¹⁶¹Os| 7/2−#|||-| ¹⁶⁶Pt| style="text-align:right" | 78| style="text-align:right" | 88| 165.99487(32)#| 294(62) μs| α| ¹⁶²Os| 0+|||-| ¹⁶⁷Pt| style="text-align:right" | 78| style="text-align:right" | 89| 166.99275(33)#| 920(120) μs| α| ¹⁶³Os| 7/2−#|||-| 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|-| 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|-| 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|-| 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|-| style="text-indent:1em" | ^171mPt| colspan=3 style="text-indent:2em" | 412.6(10) keV| 901(9) ns| IT| ¹⁷¹Pt| 13/2+|||-| 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|-| 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|-| 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|-| 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|-| 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|-| 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|-| style="text-indent:1em" | ^177mPt| colspan=3 style="text-indent:2em" | 147.5(4) keV| 2.35(4) μs| IT| ¹⁷⁷Pt| 1/2−|||-| 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|-| 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|-| 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|-| 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|-| style="text-indent:1em" | ^181mPt| colspan=3 style="text-indent:2em" | 116.65(8) keV| >300 ns| IT| ¹⁸¹Pt| 7/2−|||-| 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|-| 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|-| 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|-| style="text-indent:1em" | ^183m2Pt| colspan=3 style="text-indent:2em" | 195.90(10) keV| >150 ns| IT| ¹⁸³Pt| 9/2+|||-| 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|-| style="text-indent:1em" | ^184mPt| colspan=3 style="text-indent:2em" | 1840.3(8) 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|184.960614(28)| rowspan=2|70.9(24) min| β⁺ | ¹⁸⁵Ir| rowspan=2|9/2+| rowspan=2|| rowspan=2||-| α (0.0050%)| ¹⁸¹Os|-| style="text-indent:1em" | ^185m1Pt| colspan=3 style="text-indent:2em" | 103.41(5) keV| 33.0(8) min| β⁺| ¹⁸⁵Ir| 1/2−|||-| style="text-indent:1em" | ^185m2Pt| colspan=3 style="text-indent:2em" | 200.89(4) keV| 728(20) ns| IT| ¹⁸⁵Pt| 5/2−|||-| 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|-| ¹⁸⁷Pt| style="text-align:right" | 78| style="text-align:right" | 109| 186.960617(26)| 2.35(3) h| β⁺| ¹⁸⁷Ir| 3/2−|||-| style="text-indent:1em" | ^187mPt| colspan=3 style="text-indent:2em" | 174.38(22) keV| 311(15) μs| IT| ¹⁸⁷Pt| 11/2+|||-| 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|-| ¹⁸⁹Pt| style="text-align:right" | 78| style="text-align:right" | 111| 188.960848(11)| 10.87(12) h| β⁺| ¹⁸⁹Ir| 3/2−|||-| style="text-indent:1em" | ^189m1Pt| colspan=3 style="text-indent:2em" | 172.79(6) keV| 464(25) ns| IT| ¹⁸⁹Pt| 9/2−|||-| style="text-indent:1em" | ^189m2Pt| colspan=3 style="text-indent:2em" | 191.6(4) keV| 143(5) μs| IT| ¹⁸⁹Pt| (13/2+)|||-| ¹⁹⁰Pt| style="text-align:right" | 78| style="text-align:right" | 112| 189.95994982(71)| 4.83(3)×10¹¹ y| α^[1] | ¹⁸⁶Os| 0+| 1.2(2)×10⁻⁴||-| ¹⁹¹Pt| style="text-align:right" | 78| style="text-align:right" | 113| 190.9616763(44)| 2.83(2) d| EC| ¹⁹¹Ir| 3/2−|||-| style="text-indent:1em" | ^191m1Pt| colspan=3 style="text-indent:2em" | 100.663(20) keV| >1 μs| IT| ¹⁹¹Pt| 9/2−|||-| style="text-indent:1em" | ^191m2Pt| colspan=3 style="text-indent:2em" | 149.035(22) keV| 95(5) μs| IT| ¹⁹¹Pt| 13/2+|||-| ¹⁹²Pt| style="text-align:right" | 78| style="text-align:right" | 114| 191.9610427(28)| colspan=3 align=center|Observationally Stable^[2] | 0+| 0.00782(24)||-| style="text-indent:1em" | ^192mPt| colspan=3 style="text-indent:2em" | 2172.37(13) keV| 272(23) ns| IT| ¹⁹²Pt| 10−|||-| ¹⁹³Pt| style="text-align:right" | 78| style="text-align:right" | 115| 192.9629845(15)| 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| 193.96268350(53)| colspan=3 align=center|Observationally Stable^[3] | 0+| 0.3286(41)||-| ¹⁹⁵Pt| style="text-align:right" | 78| style="text-align:right" | 117| 194.96479433(54)| colspan=3 align=center|Observationally Stable^[4] | 1/2−| 0.3378(24)||-| style="text-indent:1em" | ^195mPt| colspan=3 style="text-indent:2em" | 259.077(23) keV| 4.010(5) d| IT| ¹⁹⁵Pt| 13/2+|||-| ¹⁹⁶Pt| style="text-align:right" | 78| style="text-align:right" | 118| 195.96495465(55)| colspan=3 align=center|Observationally Stable^[5] | 0+| 0.2521(34)||-| ¹⁹⁷Pt| style="text-align:right" | 78| style="text-align:right" | 119| 196.96734303(58)| 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| 197.9678967(23)| colspan=3 align=center|Observationally Stable^[6] | 0+| 0.0734(13)||-| ¹⁹⁹Pt| style="text-align:right" | 78| style="text-align:right" | 121| 198.9705970(23)| 30.80(21) min| β⁻| ¹⁹⁹Au| 5/2−|||-| style="text-indent:1em" | ^199mPt| colspan=3 style="text-indent:2em" | 424(2) keV| 13.48(16) s| IT| ¹⁹⁹Pt| 13/2+|||-| ²⁰⁰Pt| style="text-align:right" | 78| style="text-align:right" | 122| 199.971445(22)| 12.6(3) h| β⁻| ²⁰⁰Au| 0+|||-| ²⁰¹Pt| style="text-align:right" | 78| style="text-align:right" | 123| 200.974513(54)| 2.5(1) min| β⁻| ²⁰¹Au| (5/2−)|||-| ²⁰²Pt| style="text-align:right" | 78| style="text-align:right" | 124| 201.975639(27)| 44(15) h| β⁻| ²⁰²Au| 0+|||-| style="text-indent:1em" | ^202mPt| colspan=3 style="text-indent:2em" | 1788.5(4) keV| 141(7) μs| IT| ²⁰²Pt| (7−)|||-| ²⁰³Pt| style="text-align:right" | 78| style="text-align:right" | 125| 202.97906(22)#| 22(4) s| β⁻| ²⁰³Au| (1/2−)|||-| 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|-| style="text-indent:1em" | ^203m2Pt| colspan=3 style="text-indent:2em" | 1420(50)# keV| >100# ns| IT| ²⁰³Pt| 27/2−#|||-| style="text-indent:1em" | ^203m3Pt| colspan=3 style="text-indent:2em" | 2530(50)# keV| 641(55) ns| IT| ²⁰³Pt| 33/2+#|||-| ²⁰⁴Pt| style="text-align:right" | 78| style="text-align:right" | 126| 203.98108(22)#| 10.3(14) s| β⁻| ²⁰⁴Au| 0+|||-| style="text-indent:1em" | ^204m1Pt| colspan=3 style="text-indent:2em" | 1995.1(07) 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+)|||-| ²⁰⁵Pt| style="text-align:right" | 78| style="text-align:right" | 127| 204.98624(32)#| 2# s| β⁻ ?| ²⁰⁵Au| 9/2+#|||-| 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|-| 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|-| 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

References

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

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