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Neptunium was the first transuranium element to be discovered.
Made by Bombarding Uranium with Neutrons, Ores of metals
Edwin McMillan and Philip H. Abelson
- IUPAC allotted a temporary name to Dubnium metal as “ Unnilpentium”.
- In the production of Dubnium, thermal gradient chromatography is used.
Produced by Bombarding Am243 with Ne22, Synthetically Produced
Joint Institute for Nuclear Research