Platinum
Isotopes
### Isotopes

Platinum has six naturally occurring [isotopes](/wiki/Isotopes "Isotopes"): , , , , , and . The most [abundant](/wiki/Isotopic_abundance "Isotopic abundance") of these is , comprising 33\.83% of all platinum. It is the only stable isotope with a non\-zero [spin](/wiki/Spin_%28physics%29 "Spin (physics)"). The spin of 1/2 and other favourable magnetic properties of the nucleus are utilised in [ NMR](/wiki/Platinum-195_nuclear_magnetic_resonance "Platinum-195 nuclear magnetic resonance"). Due to its spin and large abundance,  satellite peaks are also often observed in  and  NMR spectroscopy (*e.g.,* for Pt\-phosphine and Pt\-alkyl complexes).  is the least abundant at only 0\.01%. Of the naturally occurring isotopes, only  is unstable, though it decays with a half\-life of 6\.5 years, causing an activity of 15 [Bq](/wiki/Becquerel "Becquerel")/kg of natural platinum. Other isotopes can undergo [alpha decay](/wiki/Alpha_decay "Alpha decay"), but their decay has never been observed, therefore they are considered stable. Platinum also has 38 synthetic isotopes ranging in atomic mass from 165 to 208, making the total number of known isotopes 44\. The least stable of these are  and , with half\-lives of 260 μs, whereas the most stable is  with a half\-life of 50 years. Most platinum isotopes decay by some combination of [beta decay](/wiki/Beta_decay "Beta decay") and alpha decay. , , and  decay primarily by [electron capture](/wiki/Electron_capture "Electron capture").  and  are predicted to have energetically favorable [double beta decay](/wiki/Double_beta_decay "Double beta decay") paths.


What are the naturally occurring isotopes of platinum?