Editing Copernicium (section)

===Naming===
[[File:Nikolaus Kopernikus.jpg|thumb|upright|right|alt=a painted portrait of Copernicus|[[Nicolaus Copernicus]], who formulated a heliocentric model with the planets orbiting around the Sun, replacing [[Ptolemy]]'s earlier geocentric model. |185x185px]]
Using [[Mendeleev's predicted elements|Mendeleev's nomenclature for unnamed and undiscovered elements]], copernicium should be known as ''eka-[[mercury (element)|mercury]]''. In 1979, IUPAC published recommendations according to which the element was to be called ''ununbium'' (with the corresponding symbol of ''Uub''),<ref name="iupac">{{cite journal|author=Chatt, J.|journal=Pure and Applied Chemistry|date=1979|volume=51 |issue=2|pages=381–384|title=Recommendations for the naming of elements of atomic numbers greater than 100 |doi=10.1351/pac197951020381|doi-access=free}}</ref> a [[systematic element name]] as a [[placeholder name|placeholder]], until the element was discovered (and the discovery then confirmed) and a permanent name was decided on. Although widely used in the chemical community on all levels, from chemistry classrooms to advanced textbooks, the recommendations were mostly ignored among scientists in the field, who either called it "element 112", with the symbol of ''E112'', ''(112)'', or even simply ''112''.<ref name="Haire" />

After acknowledging the GSI team's discovery, the [[IUPAC]] asked them to suggest a permanent name for element 112.<ref name="fusion" /><ref>{{cite web
|date=11 June 2009
|url=https://www.sciencedaily.com/releases/2009/06/090611210039.htm
|title=New Chemical Element in the Periodic Table
|website=[[Science Daily]]
|access-date=9 March 2018
|archive-date=14 October 2019
|archive-url=https://web.archive.org/web/20191014134703/https://www.sciencedaily.com/releases/2009/06/090611210039.htm
|url-status=live
}}</ref> On 14 July 2009, they proposed ''copernicium'' with the element symbol Cp, after [[Nicolaus Copernicus]] "to honor an outstanding scientist, who changed our view of the world".<ref>
{{Cite web
|date=14 July 2009
|title=Element 112 shall be named "copernicium"
|url=https://www.gsi.de/portrait/Pressemeldungen/14072009_e.html
|publisher=[[Gesellschaft für Schwerionenforschung]]
|url-status=dead
|archive-url=https://web.archive.org/web/20090718113516/https://www.gsi.de/portrait/Pressemeldungen/14072009_e.html
|archive-date=18 July 2009
}}</ref>

During the standard six-month discussion period among the scientific community about the naming,<ref name="bbc 20090716">{{Cite web
|date=16 July 2009
|title=New element named 'copernicium'
|url=https://news.bbc.co.uk/2/hi/science/nature/8153596.stm
|work=[[BBC News]]
|access-date=2010-02-22
|archive-date=2009-12-24
|archive-url=https://web.archive.org/web/20091224053927/http://news.bbc.co.uk/2/hi/science/nature/8153596.stm
|url-status=live
}}</ref><ref>{{Cite web
|date         = 20 July 2009
|title        = Start of the Name Approval Process for the Element of Atomic Number 112
|url          = https://www.iupac.org/news/news-detail/article/start-of-the-name-approval-process-for-the-element-of-atomic-number-112.html
|publisher    = [[IUPAC]]
|access-date   = 14 April 2012
|archive-url  = https://web.archive.org/web/20121127231211/https://www.iupac.org/news/news-detail/article/start-of-the-name-approval-process-for-the-element-of-atomic-number-112.html
|archive-date = 27 November 2012
|url-status   = dead
}}</ref>
it was pointed out that the symbol ''Cp'' was previously associated with the name ''cassiopeium'' (cassiopium), now known as [[lutetium]] (Lu).<ref>
{{Cite journal
|last1=Meija |first1=Juris 
|year=2009
|title=The need for a fresh symbol to designate copernicium
|journal=[[Nature (journal)|Nature]]
|volume=461 |issue=7262 |page=341
|bibcode=2009Natur.461..341M
|doi=10.1038/461341c
|pmid=19759598
|doi-access=free
}}</ref><ref>{{Cite web
|last1=van der Krogt
|first1=P.
|title=Lutetium
|url=https://elements.vanderkrogt.net/element.php?sym=Lu
|work=Elementymology & Elements Multidict
|access-date=2010-02-22
|archive-date=2010-01-23
|archive-url=https://web.archive.org/web/20100123003106/http://elements.vanderkrogt.net/element.php?sym=Lu
|url-status=live
}}</ref> Moreover, Cp is frequently used today to mean the [[Cyclopentadienyl complex|cyclopentadienyl ligand]] (C<sub>5</sub>H<sub>5</sub>).<ref>{{cite web |url=https://iupac.org/wp-content/uploads/2019/10/VIII_09min.pdf |title=Minutes, Division VIII Committee meeting, Glasgow, 2009 |author=<!--Not stated--> |date=2009 |website=iupac.org |publisher=IUPAC |access-date=11 January 2024 |quote= |archive-date=12 August 2021 |archive-url=https://web.archive.org/web/20210812135005/https://iupac.org/wp-content/uploads/2019/10/VIII_09min.pdf |url-status=live }}</ref> Primarily because cassiopeium (Cp) was (until 1949) accepted by IUPAC as an alternative allowed name for lutetium,<ref>{{cite journal |last1=Tatsumi |first1=Kazuyuki |last2=Corish |first2=John |date=2010 |title=Name and symbol of the element with atomic number 112 (IUPAC Recommendations 2010) |url=https://publications.iupac.org/pac/pdf/2010/pdf/8203x0753.pdf |journal=Pure and Applied Chemistry |volume=82 |issue=3 |pages=753–755 |doi=10.1351/PAC-REC-09-08-20 |access-date=11 January 2024 |archive-date=11 January 2024 |archive-url=https://web.archive.org/web/20240111090606/https://publications.iupac.org/pac/pdf/2010/pdf/8203x0753.pdf |url-status=live }}</ref> the IUPAC disallowed the use of Cp as a future symbol, prompting the GSI team to put forward the symbol Cn as an alternative. On 19 February 2010, the 537th anniversary of Copernicus' birth, IUPAC officially accepted the proposed name and symbol.<ref name="bbc 20090716" /><ref>{{cite web
|date         = 19 February 2010
|title        = IUPAC Element 112 is Named Copernicium
|url          = https://stage.iupac.org/web/nt/2010-02-20_112_Copernicium
|publisher    = [[IUPAC]]
|access-date   = 2012-04-13
|archive-url  = https://web.archive.org/web/20160304090404/https://stage.iupac.org/web/nt/2010-02-20_112_Copernicium
|archive-date = 4 March 2016
|url-status   = dead
}}</ref>
{{clear}}