Since the 2018 review (1) one new light isotope of mass 165 (2) and four new heavy isotopes of masses 209 to 212 (3) have been identified for platinum (Table I). The heavy isotopes are only identified as being ‘particle stable’ – that is resistant to proton or neutron decay but all are expected to decay by beta decay in which an electron and anti-electron neutrino are emitted when a neutron in the nucleus decays to a proton, so that the mass number of the daughter isotope remains the same but the atomic number is increased by one. The light isotope decays by alpha decay in which the emittance of a helium four ion means that the daughter isotope mass is four lower than the original parent isotope whilst the atomic number is reduced by two. The half-life is 0.4 ± 0.2 ms normalised from the reported value of 0.26 (−0.09 +0.26) ms.