Isotopes of platinum

Main isotopes of platinum

iso NA half-life DM DE (MeV) DP 190Pt 0.012% 6.5×1011 y α 3.252 186Os 192Pt 0.782% is stable with 114 neutrons 193Pt syn 50 y ε – 193Ir 194Pt 32.864% is stable with 116 neutrons 195Pt 33.775% is stable with 117 neutrons 196Pt 25.211% is stable with 118 neutrons 198Pt 7.356% is stable with 120 neutrons
Standard atomic weight (Ar)	195.084(9)

Natural platinum (₇₈Pt) 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.

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