Boisbaudran, Paul Émile Lecoq de

Boisbaudran, Paul Émile Lecoq de

(pôl āmēl` ləkôk` də bwäbōdräN`), 1838–1912, French discoverer of the elements gallium, samarium, and dysprosium. He also made contributions in the field of spectroscopy, including his experimentation with the rare-earth metals.