Editing Roentgenium (section)

==Experimental chemistry==
Unambiguous determination of the chemical characteristics of roentgenium has yet to have been established<ref name="Düllmann">{{cite journal |last1=Düllmann |first1=Christoph E. |date=2012 |title=Superheavy elements at GSI: a broad research program with element 114 in the focus of physics and chemistry |journal=Radiochimica Acta |volume=100 |issue=2 |pages=67–74 |doi=10.1524/ract.2011.1842 |s2cid=100778491 }}</ref> due to the low yields of reactions that produce roentgenium isotopes.<ref name="Haire" /> For chemical studies to be carried out on a [[transactinide element|transactinide]], at least four atoms must be produced, the half-life of the isotope used must be at least 1&nbsp;second, and the rate of production must be at least one atom per week.<ref name="DoiX" /> Even though the half-life of <sup>282</sup>Rg, the most stable confirmed roentgenium isotope, is 100&nbsp;seconds, long enough to perform chemical studies, another obstacle is the need to increase the rate of production of roentgenium isotopes and allow experiments to carry on for weeks or months so that statistically significant results can be obtained. Separation and detection must be carried out continuously to separate out the roentgenium isotopes and allow automated systems to experiment on the gas-phase and solution chemistry of roentgenium, as the yields for heavier elements are predicted to be smaller than those for lighter elements. However, the experimental chemistry of roentgenium has not received as much attention as that of the heavier elements from [[copernicium]] to [[livermorium]],<ref name="Haire" /><ref name="Düllmann" /><ref name="Eichler">{{cite journal |last=Eichler |first=Robert |date=2013 |title=First foot prints of chemistry on the shore of the Island of Superheavy Elements |journal=Journal of Physics: Conference Series |volume=420 |issue=1 |doi=10.1088/1742-6596/420/1/012003 |pages=012003|arxiv=1212.4292 |bibcode=2013JPhCS.420a2003E |s2cid=55653705 }}</ref> despite early interest in theoretical predictions due to relativistic effects on the ''n''s subshell in group 11 reaching a maximum at roentgenium.<ref name="Haire" /> The isotopes <sup>280</sup>Rg and <sup>281</sup>Rg are promising for chemical experimentation and may be produced as the granddaughters of the [[moscovium]] isotopes <sup>288</sup>Mc and <sup>289</sup>Mc respectively;<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> their parents are the [[nihonium]] isotopes <sup>284</sup>Nh and <sup>285</sup>Nh, which have already received preliminary chemical investigations.<ref name="Superheavy element Aksenov"/>