<Dd> Pt + 4 HNO + 6 HCl → H PtCl + 4 NO + 4 H O </Dd> <P> As a soft acid, platinum has a great affinity for sulfur, such as on dimethyl sulfoxide (DMSO); numerous DMSO complexes have been reported and care should be taken in the choice of reaction solvent . </P> <P> In 2007, Gerhard Ertl won the Nobel Prize in Chemistry for determining the detailed molecular mechanisms of the catalytic oxidation of carbon monoxide over platinum (catalytic converter). </P> <P> Platinum has six naturally occurring isotopes: Pt, Pt, Pt, Pt, Pt, and Pt . The most abundant of these is Pt, comprising 33.83% of all platinum . It is the only stable isotope with a non-zero spin; with a spin of /, Pt satellite peaks are often observed in H and P NMR spectroscopy (i.e., Pt - phosphine and Pt - alkyl complexes). Pt is the least abundant at only 0.01% . Of the naturally occurring isotopes, only Pt is unstable, though it decays with a half - life of 6.5 × 10 years, causing an activity of 15 Bq / kg of natural platinum . Pt can undergo alpha decay, but its decay has never been observed (the half - life is known to be longer than 3.2 × 10 years); therefore, it is considered stable . Platinum also has 31 synthetic isotopes ranging in atomic mass from 166 to 202, making the total number of known isotopes 37 . The least stable of these is Pt, with a half - life of 300 μs, whereas the most stable is Pt with a half - life of 50 years . Most platinum isotopes decay by some combination of beta decay and alpha decay . Pt, Pt, and Pt decay primarily by electron capture . Pt and Pt are predicted to have energetically favorable double beta decay paths . </P>

Where is platinum found and how is it obtained