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Jean Charles Galissard de Marignac
Jean Charles Galissard de Marignac (April 24, 1817–April 15, 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 codiscovery of gadolinium in 1880.
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