röntgeni
Röntgeni, or roentgenium, is a synthetic chemical element with the symbol Rg and atomic number 111. It is the heaviest element whose existence has been confirmed and is placed in group 11 of the periodic table, where it is expected to share some chemistry with copper, silver, and gold. The name honors Wilhelm Conrad Röntgen, the discoverer of X-rays; the name was approved by IUPAC in 2004.
Röntgenium is produced only in particle accelerators through fusion reactions that combine heavy target nuclei with
All isotopes of roentgenium are radioactive and highly unstable. The known isotopes have very short half-lives,
Chemistry and physics studies of roentgenium focus on its place in the periodic table and the influence
In summary, roentgenium is a laboratory-created, highly radioactive superheavy element with no practical applications, studied to
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