Editing Bohrium (section)

==Experimental chemistry==
In 1995, the first report on attempted isolation of the element was unsuccessful, prompting new theoretical studies to investigate how best to investigate bohrium (using its lighter homologs technetium and rhenium for comparison) and removing unwanted contaminating elements such as the trivalent [[actinide]]s, the [[group 5 element]]s, and [[polonium]].<ref>{{cite journal|title=Chemical Separation Procedure Proposed for Studies of Bohrium|last1=Malmbeck|first1=R.|last2=Skarnemark|first2=G.|last3=Alstad|first3=J.|last4=Fure|first4=K.|last5=Johansson|first5=M.|last6=Omtvedt|first6=J. P.|journal=Journal of Radioanalytical and Nuclear Chemistry|volume=246|pages=349|date=2000|doi=10.1023/A:1006791027906|issue=2|bibcode=2000JRNC..246..349M |s2cid=93640208}}</ref>

In 2000, it was confirmed that although relativistic effects are important, bohrium behaves like a typical group 7 element.<ref>{{cite journal|last1=Gäggeler|first1=H. W.|last2=Eichler|first2=R.|last3=Brüchle|first3=W.|last4=Dressler|first4=R.|last5=Düllmann|first5=Ch. E.|last6=Eichler|first6=B.|last7=Gregorich|first7=K. E.|last8=Hoffman|first8=D. C.|last9=Hübener|first9=S.|display-authors=8 |title=Chemical characterization of bohrium (element 107)|journal=Nature|volume=407|issue=6800|pages=63–5|date=2000|pmid=10993071|doi=10.1038/35024044|bibcode=2000Natur.407...63E|s2cid=4398253}}</ref> A team at the [[Paul Scherrer Institute]] (PSI) conducted a chemistry reaction using six atoms of <sup>267</sup>Bh produced in the reaction between <sup>249</sup>Bk and <sup>22</sup>Ne ions. The resulting atoms were thermalised and reacted with a HCl/O<sub>2</sub> mixture to form a volatile oxychloride. The reaction also produced isotopes of its lighter homologues, technetium (as <sup>108</sup>Tc) and rhenium (as <sup>169</sup>Re). The isothermal adsorption curves were measured and gave strong evidence for the formation of a volatile oxychloride with properties similar to that of rhenium oxychloride. This placed bohrium as a typical member of group 7.<ref name="00Ei01">{{cite web|url=http://www.gsi.de/informationen/wti/library/scientificreport2000/Chemistry/9/r_eichler_jb2000.pdf|title=Gas chemical investigation of bohrium (Bh, element 107)|last=Eichler |first=R. |display-authors=etal |work=GSI Annual Report 2000|access-date=2008-02-29|archive-url=https://web.archive.org/web/20120219002121/http://www.gsi.de/informationen/wti/library/scientificreport2000/Chemistry/9/r_eichler_jb2000.pdf|archive-date=2012-02-19}}</ref> The adsorption enthalpies of the oxychlorides of technetium, rhenium, and bohrium were measured in this experiment, agreeing very well with the theoretical predictions and implying a sequence of decreasing oxychloride volatility down group 7 of TcO<sub>3</sub>Cl &gt; ReO<sub>3</sub>Cl &gt; BhO<sub>3</sub>Cl.<ref name="Haire" />

:2 Bh + 3 {{chem|O|2}} + 2 HCl → 2 {{chem|BhO|3|Cl}} + {{chem|H|2}}

The longer-lived heavy isotopes of bohrium, produced as the daughters of heavier elements, offer advantages for future radiochemical experiments. Although the heavy isotope <sup>274</sup>Bh requires a rare and highly radioactive [[berkelium]] target for its production, the isotopes <sup>272</sup>Bh, <sup>271</sup>Bh, and <sup>270</sup>Bh can be readily produced as daughters of more easily produced [[moscovium]] and [[nihonium]] isotopes.<ref name="Moody">{{cite book |chapter=Synthesis of Superheavy Elements |last1=Moody |first1=Ken |editor1-first=Matthias |editor1-last=Schädel |editor2-first=Dawn |editor2-last=Shaughnessy |title=The Chemistry of Superheavy Elements |publisher=Springer Science & Business Media |edition=2nd |pages=24–8 |isbn=9783642374661|date=2013-11-30 }}</ref>