Editing Dubnium (section)

===Background===
[[Uranium]], element 92, is the heaviest element to occur in significant quantities in nature; heavier elements can only be practically produced by synthesis. The first synthesis of a new element—[[neptunium]], element 93—was achieved in 1940 by a team of researchers in the United States.<ref>{{Cite book|title=Radiochemistry and Nuclear Chemistry|last1=Choppin|first1=G. R.|last2=Liljenzin|first2=J.-O.|last3=Rydberg|first3=J.|publisher=[[Elsevier]]|year=2002|isbn=978-0-7506-7463-8|page=416}}</ref> In the following years, American scientists synthesized the elements up to [[mendelevium]], element 101, which was synthesized in 1955. From [[nobelium|element 102]], the priority of discoveries was contested between American and Soviet physicists.<ref>{{cite report|url=http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/28/017/28017156.pdf |archive-url=https://web.archive.org/web/20171009195038/http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/28/017/28017156.pdf |archive-date=2017-10-09 |url-status=live|title=The Transuranium Elements: From Neptunium and Plutonium to Element 112|last=Hoffman|first=D. C.|publisher=Lawrence Livermore National Laboratory|access-date=October 10, 2017|year=1996}}</ref> Their rivalry resulted in a race for new elements and credit for their discoveries, later named the [[Transfermium Wars]].<ref>{{cite journal | journal = Chemical & Engineering News | date = 1994 | volume = 74 | issue = 22 | pages = 2–3 | title = The Transfermium Wars | first=P. | last=Karol| doi = 10.1021/cen-v072n044.p002 | doi-access = free }}</ref>