George de Hevesy, Hungarian chemist

George de Hevesy, Hungarian chemist

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Caption: George de Hevesy (1885-1966), Hungarian chemist. In 1923, de Hevesy discovered the element hafnium (Hf), predicted from Mendeleev's periodic table. The same year, he developed a technique called radioactive labelling (or tracing). In this, an element is replaced by one of its chemically identical radioactive isotopes. This is traced through a reaction by its radioactivity. For these discoveries, de Hevesy was awarded the 1943 Nobel Prize in Chemistry. He was made a Foreign Member of the Royal Society (1939) and received its Copley Medal (1949). Photographed in 1950 at his laboratory in Stockholm, Sweden.

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