Editing Group 6 element (section)

===Discoveries===
Chromium was first reported on July 26, 1761, when [[Johann Gottlob Lehmann (scientist)|Johann Gottlob Lehmann]] found an orange-red mineral in the [[Beryozovskoye deposit|Beryozovskoye mines]] in the [[Ural Mountains]] of [[Russia]], which he named "Siberian red lead," which was found out in less than 10 years to be a bright [[yellow]] pigment.<ref name="ChromiumVI"/> Though misidentified as a [[lead]] compound with [[selenium]] and [[iron]] components, the mineral was [[crocoite]] with a formula of [[lead chromate|PbCrO<sub>4</sub>]].<ref name="ChromiumVI">{{cite book|title = Chromium (VI) Handbook|publisher = CRC Press|year = 2005|isbn = 978-1-56670-608-7|pages = 7–11|author1=Guertin, Jacques |author2=Jacobs, James Alan |author3=Avakian, Cynthia P. }}</ref> Studying the mineral in 1797, [[Louis Nicolas Vauquelin]] produced [[chromium(VI) oxide|chromium trioxide]] by mixing crocoite with [[hydrochloric acid]], and metallic chromium by heating the oxide in a charcoal oven a year later.<ref>{{cite journal|url = https://books.google.com/books?id=6dgPAAAAQAAJ|journal =Journal of Natural Philosophy, Chemistry, and the Arts|year = 1798|page = 146|volume =3|title = Memoir on a New Metallic Acid which exists in the Red Lead of Sibiria|first = Louis Nicolas|last = Vauquelin}}</ref> He was also able to detect traces of chromium in precious [[gemstone]]s, such as [[ruby]] or [[emerald]].<ref name="ChromiumVI"/><ref>{{Cite web|last = van der Krogt|first = Peter|title = Chromium|url = http://elements.vanderkrogt.net/element.php?sym=Cr|access-date = 2008-08-24}}</ref>

[[Molybdenite]]—the principal ore from which molybdenum is now extracted—was previously known as molybdena, which was confused with and often implemented as though it were [[graphite]]. Like graphite, molybdenite can be used to blacken a surface or as a solid lubricant.<ref name="Lansdown1999">{{cite book | last1 = Lansdown | first1 = A.R. | title = Molybdenum disulphide lubrication | volume = 35 | work = Tribology and Interface Engineering | publisher = Elsevier | year = 1999 | isbn = 978-0-444-50032-8}}</ref> Even when molybdena was distinguishable from graphite, it was still confused with a [[galena]] (a common lead ore), which took its name from [[Ancient Greek]] {{lang|grc|Μόλυβδος}} ''{{lang|grc-Latn|molybdos}}'', meaning ''lead''.<ref name="nbb">{{cite book|last = Emsley|first = John|title = Nature's Building Blocks|url=https://books.google.com/books?id=j-Xu07p3cKwC&pg=PA265|publisher = Oxford University Press|year= 2001|location = Oxford|pages = 262–266|isbn =0-19-850341-5}}</ref> It was not until 1778 that [[Sweden|Swedish]] chemist [[Carl Wilhelm Scheele]] realized that molybdena was neither graphite nor lead.<ref name="elemental">{{cite web|last = Gagnon|first = Steve|title = Molybdenum|publisher = Jefferson Science Associates, LLC|url = http://education.jlab.org/itselemental/ele042.html|access-date = 2007-05-06}}</ref><ref>{{cite journal|author = Scheele, C. W. K.|title = Versuche mit Wasserbley;Molybdaena|journal = Svenska Vetensk. Academ. Handlingar|page=238|year = 1779|volume = 40|url = http://resolver.sub.uni-goettingen.de/purl?PPN324352840_0040}}</ref> He and other chemists then correctly assumed that it was the ore of a distinct new element, named ''molybdenum'' for the mineral in which it was discovered. [[Peter Jacob Hjelm]] successfully isolated molybdenum by using [[carbon]] and [[linseed oil]] in 1781.<ref name="nbb" /><ref>{{cite journal|author = Hjelm, P. J.|title = Versuche mit Molybdäna, und Reduction der selben Erde|journal = Svenska Vetensk. Academ. Handlingar|page = 268|year = 1788|volume = 49|url = http://resolver.sub.uni-goettingen.de/purl?PPN324352840_0009_02_NS}}</ref>

Regarding tungsten, in 1781 [[Carl Wilhelm Scheele]] discovered that a new [[acid]], [[tungstic acid]], could be made from [[scheelite]] (at the time named tungsten). Scheele and [[Torbern Bergman]] suggested that it might be possible to obtain a new metal by reducing this acid.<ref name="SaundersN">{{cite book|last=Saunders|first=Nigel|title=Tungsten and the Elements of Groups 3 to 7 (The Periodic Table)|publisher=Heinemann Library|location=[[Chicago, Illinois]]|date=February 2004|isbn=1-4034-3518-9|url-access=registration|url=https://archive.org/details/tungstenelements00nige}}</ref> In 1783, [[José Elhuyar|José]] and [[Fausto Elhuyar]] found an acid made from wolframite that was identical to tungstic acid. Later that year, in [[Spain]], the brothers succeeded in isolating tungsten by reduction of this acid with [[charcoal]], and they are credited with the discovery of the element.<ref name="ITIAnews_0605">{{cite news|url=http://www.itia.info/FileLib/Newsletter_2005_06.pdf|title=ITIA Newsletter|date=June 2005|publisher=International Tungsten Industry Association|access-date=2008-06-18|archive-url=https://web.archive.org/web/20110721214335/http://www.itia.info/FileLib/Newsletter_2005_06.pdf|archive-date=2011-07-21}}</ref><ref name="ITIAnews_1205">{{cite news|url=http://www.itia.info/FileLib/Newsletter_2005_12.pdf|title=ITIA Newsletter|date=December 2005|publisher=International Tungsten Industry Association|access-date=2008-06-18|archive-url=https://web.archive.org/web/20110721214335/http://www.itia.info/FileLib/Newsletter_2005_12.pdf|archive-date=2011-07-21}}</ref>

Seaborgium was first produced by a team of scientists led by Albert Ghiorso who worked at the Lawrence Berkeley Laboratory in Berkeley, California, in 1974. They created seaborgium by bombarding atoms of californium-249 with ions of oxygen-18 until seaborgium-263 was produced.