Editing Chemical element (section)

=== Recently discovered elements ===
The first [[transuranium element]] (element with an atomic number greater than 92) discovered was [[neptunium]] in 1940. Since 1999, the [[IUPAC/IUPAP Joint Working Party]] has considered claims for the discovery of new elements. As of January 2016, all 118 elements have been confirmed by IUPAC as being discovered. The discovery of element 112 was acknowledged in 2009, and the name ''copernicium'' and the chemical symbol ''Cn'' were suggested for it.<ref>{{cite web|date=20 July 2009|title=IUPAC Announces Start of the Name Approval Process for the Element of Atomic Number 112|url=http://media.iupac.org/news/112_Naming_Process_20090720.pdf|publisher=IUPAC|access-date=27 August 2009|archive-date=13 March 2012|archive-url=https://web.archive.org/web/20120313014559/http://media.iupac.org/news/112_Naming_Process_20090720.pdf|url-status=live}}</ref> The name and symbol were officially endorsed by IUPAC on 19 February 2010.<ref>{{cite web|date=20 February 2010 |title= Element 112 is Named Copernicium |url=http://www.iupac.org/web/nt/2010-02-20_112_Copernicium |publisher=IUPAC |url-status=dead |archive-url=https://web.archive.org/web/20100224054826/http://www.iupac.org/web/nt/2010-02-20_112_Copernicium |archive-date=24 February 2010 }}</ref> The heaviest element that is believed to have been synthesised to date is element 118, [[oganesson]], on 9 October 2006, by the [[Joint Institute for Nuclear Research|Flerov Laboratory]] of Nuclear Reactions in [[Dubna]], Russia.{{r|Schewe}}<ref>{{cite journal|year=2006|title=Evidence for Dark Matter |journal=[[Physical Review C]]|volume=74|issue=4|pages=044602|doi=10.1103/PhysRevC.74.044602|bibcode=2006PhRvC..74d4602O |bibcode-access=free |last1=Oganessian|first1=Yu. Ts.|last2=Utyonkov|first2=V.|last3=Lobanov|first3=Yu.|last4=Abdullin|first4=F.|last5=Polyakov|first5=A.|last6=Sagaidak|first6=R.|last7=Shirokovsky|first7=I.|last8=Tsyganov|first8=Yu.|last9=Voinov|first9=A.|display-authors=8|doi-access=free}}</ref> [[Tennessine]], element 117 was the latest element claimed to be discovered, in 2009.<ref name="jinr">{{cite web|last=Greiner |first=W. |title=Recommendations |url=http://www.jinr.ru/img_sections/PAC/NP/31/PAK_NP_31_recom_eng.pdf |work=31st meeting, PAC for Nuclear Physics |publisher=[[Joint Institute for Nuclear Research]] |url-status=dead |archive-url=https://web.archive.org/web/20100414173735/http://www.jinr.ru/img_sections/PAC/NP/31/PAK_NP_31_recom_eng.pdf |archive-date=14 April 2010 }}</ref> On 28 November 2016, scientists at the IUPAC officially recognised the names for the four newest elements, with atomic numbers 113, 115, 117, and 118.<ref name="IUPAC-20161130">{{cite news |author=Staff |title=IUPAC Announces the Names of the Elements 113, 115, 117, and 118 |url=https://iupac.org/iupac-announces-the-names-of-the-elements-113-115-117-and-118/ |date=30 November 2016 |work=IUPAC |access-date=1 December 2016 |archive-date=29 July 2018 |archive-url=https://web.archive.org/web/20180729210456/https://iupac.org/iupac-announces-the-names-of-the-elements-113-115-117-and-118/ |url-status=live }}</ref><ref name="NYT-20161201">{{cite news |last=St. Fleur |first=Nicholas |title=Four New Names Officially Added to the Periodic Table of Elements |url=https://www.nytimes.com/2016/12/01/science/periodic-table-new-elements.html |archive-url=https://ghostarchive.org/archive/20220101/https://www.nytimes.com/2016/12/01/science/periodic-table-new-elements.html |archive-date=2022-01-01 |url-access=limited |date=1 December 2016 |work=[[The New York Times]] |access-date=1 December 2016 }}{{cbignore}}</ref>