Jean Charles Galissard de Marignac

in Geneva, Switzerland
April 24, 1817

April 15, 1894




Jean Charles Galissard de Marignac (24 April 1817 – 15 April 1894) was a Swiss chemist whose work with atomic weights suggested the possibility of isotopes and the packing fraction of nuclei and whose study of the rare earth elements led to his discovery of ytterbium in 1878 and co discovery of gadolinium in 1880.

Born in Geneva, he was twenty-one years old when he began to attend the Ecole Polytechnique in Paris, and from 1837 to 1839 studied at the Ecole des Mines. Then, after a short time in Justus von Liebig's laboratory at Gießen, and in the Sèvres porcelain factory, he became in 1841 a professor of chemistry at the academy of Geneva. In 1845 he was appointed professor of mineralogy also, and held both chairs until 1878, when ill-health

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