Josef Mattauch
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Josef Mattauch was a nuclear physicist and chemist. He was known for the development of the Mattauch-Herzog double-focusing mass spectrometer, for his work on the investigation of isotopic abundances
J Mattauch
Mattauch isobar rule
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The Mattauch isobar rule, formulated by Josef Mattauch in 1934, states that if two adjacent elements on the periodic table have isotopes of the same mass number, one of the isotopes must be radioactiv
Josef Mattauch
…of atomic weights. Much of his career was spent at the Kaiser Wilhelm Institute for Chemistry (later the Max Planck Institute). He developed the Mattauch isobar rule ("Isobarenregel") in 1934. He correctly predicted that the last of the rare earth elements, element 61 (later named promethium), would not have stable…
The negative of binding energy per nucleon for nuclides with atomic mass number 125 plotted as a function of atomic number. The profile of binding energy across the valley of stability is roughly a parabola. Tellurium-125 (52Te) is stable, while antimony-125 (51Sb) is unstable to β− decay.