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Isotopes of platinum#Platinum-195

{{Short description|none}}

{{Infobox platinum isotopes}}

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, 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).

List of isotopes

{{Anchor|Platinum-201m}}

{{Isotopes table

|symbol=Pt

|refs=NUBASE2020, AME2020 II

|notes=m, unc(), mass#, exen#, hl-nst, spin(), spin#, daughter-st, daughter-nst, IT, EC

}}

|-id=Platinum-165

| 165Pt

| style="text-align:right" | 78

| style="text-align:right" | 87

| 164.99966(43)#

| 370(180) μs

| α

| 161Os

| 7/2−#

|

|

|-id=Platinum-166

| 166Pt

| style="text-align:right" | 78

| style="text-align:right" | 88

| 165.99487(32)#

| 294(62) μs

| α

| 162Os

| 0+

|

|

|-id=Platinum-167

| 167Pt

| style="text-align:right" | 78

| style="text-align:right" | 89

| 166.99275(33)#

| 920(120) μs

| 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) μs

| 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) μs

| 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) μs

| 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

| αTheorized to also undergo β+β+ decay to 190Os

| 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 μs

| IT

| 191Pt

| 9/2−

|

|

|-id=Platinum-191m2

| style="text-indent:1em" | 191m2Pt

| colspan=3 style="text-indent:2em" | 149.035(22) keV

| 95(5) μs

| 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 StableBelieved to undergo α decay to 188Os with a half-life over 6.0×1016 years

| 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 StableBelieved to undergo α decay to 190Os

| 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 StableBelieved to undergo α decay to 191Os with a half-life over 6.3×1018 years

| 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 StableBelieved to undergo α decay to 192Os

| 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 StableBelieved to undergo α decay to 194Os or double β− decay to 198Hg with a half-life over 3.20×1014 years

| 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) μs

| 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) μs

| IT

| 204Pt

| (5−)

|

|

|-id=Platinum-204m2

| style="text-indent:1em" | 204m2Pt

| colspan=3 style="text-indent:2em" | 2035(23) keV

| 55(3) μs

| 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

{{Isotopes table/footer}}

References

{{Reflist}}

  • Isotope masses from:
  • {{NUBASE 2003}}
  • Isotopic compositions and standard atomic masses from:
  • {{CIAAW2003}}
  • {{CIAAW 2005}}
  • Half-life, spin, and isomer data selected from the following sources.
  • {{NUBASE 2003}}
  • {{NNDC}}
  • {{CRC85|chapter=11}}

{{Navbox element isotopes}}

Category:Platinum

Platinum