George de Hevesy

Hevesy György was born in Budapest, Hungary, to a wealthy and ennobled family of Hungarian-Jewish descent,[7] the fifth of eight children to his parents Lajos Bischitz and Baroness Eugénia (Jenny) Schossberger (ennobled as "De Tornya"). Grandparents from both sides of the family had provided the presidents of the Jewish community of Pest.[7] His parents converted to Roman Catholicism.[8] George grew up in Budapest and graduated high school in 1903 from Piarista Gimnázium. The family's name in 1904 was Hevesy-Bischitz, and Hevesy later changed his own.

De Hevesy began his studies in chemistry at the University of Budapest for one year, and at the Technical University of Berlin for several months, but transferred to the University of Freiburg. There he met Ludwig Gattermann. In 1906, he started his Ph.D. thesis with Georg Franz Julius Meyer,[9] acquiring his doctorate in physics in 1908. In 1908, Hevesy was offered a position at the ETH Zürich, Switzerland, yet being independently wealthy, he was able to choose his research environment. In succession he worked with Fritz Haber in Karlsruhe, Germany, then with Ernest Rutherford in Manchester, England, where he also met Niels Bohr. Back at home in Budapest, he was appointed professor in physical chemistry in 1918. In 1920, he settled in Copenhagen.

In 1922, de Hevesy co-discovered (with Dirk Coster) the element hafnium (₇₂Hf) (Latin Hafnia for "Copenhagen", the home town of Niels Bohr). Mendeleev's 1869 periodic table arranged the chemical elements into a logical system, but a chemical element with 72 protons was missing. Hevesy determined to look for that element on the basis of Bohr's atomic model. The mineralogical museum of Norway and Greenland in Copenhagen furnished the material for the research. Characteristic X-ray spectra recordings made of the sample indicated that a new element was present. The accepted account has been disputed by Mansel Davies and Eric Scerri who attribute the prediction that element 72 would be a transition element to the chemist Charles Bury.

Supported financially by the Rockefeller Foundation, Hevesy had a very productive year. He developed the X-ray fluorescence analytical method, and discovered the samarium alpha-ray. It was here he began the use of radioactive isotopes in studying the metabolic processes of plants and animals, by tracing chemicals in the body by replacing part of stable isotopes with small quantities of the radioactive isotopes. In 1923, Hevesy published the first study on the use of the naturally radioactive ²¹²Pb as radioactive tracer to follow the absorption and translocation in the roots, stems and leaves of Vicia faba, also known as the broad bean.[10][11] Later, in 1943, the work on radioactive tracing would earn Hevesy the Nobel Prize in Chemistry.[12]

In 1924, Hevesy returned to Freiburg as Professor of Physical Chemistry, and in 1930 went to Cornell University, Ithaca as Baker Lecturer. Four years later he resumed his activities at Niels Bohr's Institute, based there through 1952. During 1943 he was domiciled in Stockholm and was an Associate of the Institute of Research in Organic Chemistry. In 1949 he was elected Franqui Professor in the University of Ghent. In his retirement, he remained an active scientific associate of the University of Stockholm. Hevesy was offered and accepted a job from the University of Freiburg.