Isotopes of platinum

Natural platinum (Pt) 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.

Relative atomic mass: 195.084(9).