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Martin Heinrich Klaproth who was a German chemist discovered Uranium in the mineral pitchblende in 1789. Martin Heinrich Klaproth discovered uranium dioxide instead of pure uranium. Later Eugène-Melchoir Péligot, a French chemist isolated pure uranium by heating uranium dioxide with potassium in a platinum crucible. A French physicist Antoine Henri Becquerel discovered radioactivity with a sample of uranium. Uranium is named after the planet Uranus.