The Relative Abundance of the Isotopes in Mn, Cb, Pd, Pt, Ir, Rh and Co

Using a new type of ion source, the abundances of the isotopes of Pd, Ir and Pt were measured and the atomic weights deduced from these values. The atomic weight of Ir was found to be quite different from the chemical value. The analysis of Mn and Cb confirmed the simple nature of these elements to a higher degree than known before. Evidence for the existence of ${\mathrm{Rh}}^{101}$ present to one part in 1300 of ${\mathrm{Rh}}^{103}$ was obtained. Likewise ${\mathrm{Co}}^{57}$, present to one part in 600 of ${\mathrm{Co}}^{59}$, was found.