The element uranium was discovered in 1789 by Martin Heinrich Klaproth. He obtained it from the mineral pitchblende. It was named after the planet Uranus, which was then recently discovered. Uranium metal was isolated in 1841 by the French chemist Eugene-Melchior Peligot.
Neptunium was first produced in the year 1940 by Edwin McMillan and Philip H. Abelson at the Berkeley Radiation Laboratory of the University of California. It is named after the planet Neptune.
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