Editing Roentgenium (section)

===Stability and half-lives===
All roentgenium isotopes are extremely unstable and radioactive; in general, the heavier isotopes are more stable than the lighter. The most stable known roentgenium isotope, <sup>282</sup>Rg, is also the heaviest known roentgenium isotope; it has a half-life of 100&nbsp;seconds. The unconfirmed <sup>286</sup>Rg is even heavier and appears to have an even longer half-life of about 10.7&nbsp;minutes, which would make it one of the longest-lived superheavy nuclides known; likewise, the unconfirmed <sup>283</sup>Rg appears to have a long half-life of about 5.1&nbsp;minutes. The isotopes <sup>280</sup>Rg and <sup>281</sup>Rg have also been reported to have half-lives over a second. The remaining isotopes have half-lives in the millisecond range.<ref name="nuclidetable" />

The missing isotopes between <sup>274</sup>Rg and <sup>278</sup>Rg are too light to be produced by hot fusion and too heavy to be produced by cold fusion. A possible synthesis method is to populate them from above, as daughters of nihonium or moscovium isotopes that can be produced by hot fusion.{{sfn|Zagrebaev|Karpov|Greiner|2013|pp=1–15}} The isotopes <sup>283</sup>Rg and <sup>284</sup>Rg could be synthesised using charged-particle evaporation, using the <sup>238</sup>U+<sup>48</sup>Ca reaction where a proton is evaporated alongside some neutrons.<ref name=Yerevan2023PPT>{{cite conference |url=https://indico.jinr.ru/event/3622/contributions/20021/attachments/15292/25806/Yerevan2023.pdf |title=Interesting fusion reactions in superheavy region |first1=J. |last1=Hong |first2=G. G. |last2=Adamian |first3=N. V. |last3=Antonenko |first4=P. |last4=Jachimowicz |first5=M. |last5=Kowal |conference=IUPAP Conference "Heaviest nuclei and atoms" |publisher=Joint Institute for Nuclear Research |date=26 April 2023 |access-date=30 July 2023}}</ref><ref name=pxn>{{cite journal |last1=Hong |first1=J. |last2=Adamian |first2=G. G. |last3=Antonenko |first3=N. V. |date=2017 |title=Ways to produce new superheavy isotopes with ''Z''&nbsp;=&nbsp;111–117 in charged particle evaporation channels |journal=Physics Letters B |volume=764 |pages=42–48 |doi=10.1016/j.physletb.2016.11.002 |bibcode=2017PhLB..764...42H|doi-access=free }}</ref>