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Platinum has 6 naturally occurring isotopes, all of which have 78 protons. The number of neutrons can vary, but the most common isotopes have between 116 and 118 neutrons. The full list of isotopes is:

  • 190Pt (78 protons and 112 neutrons)
  • 192Pt (78 protons and 114 neutrons)
  • 194Pt (78 protons and 116 neutrons) about 1/3 of all platinum
  • 195Pt (78 protons and 117 neutrons) about 1/3 of all platinum
  • 196Pt (78 protons and 118 neutrons) about 1/4 of all platinum
  • 198Pt (78 protons and 120 neutrons) about 1/14 of all platinum
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13y ago

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