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Rg roentgenium
Atomic 111 ── synthetic_superheavy ── Tier 1
No commercial production
Wikipedia↗

No commercial production.

Roentgenium is a pure research element. GSI first synthesized element 111 in December 1994 by fusing nickel-64 with bismuth-209, observing three decay chains attributed to Rg-272. IUPAC recognized the discovery in 2003 and formally adopted the name roentgenium with symbol Rg on 1 November 2004.

There is no mine output, refining stage, reserves base, or commercial end-use market to describe. The element only exists as individual atoms created in accelerator facilities. Later superheavy-element work at JINR generated roentgenium isotopes such as Rg-282 as daughters in decay chains from heavier nuclei, and NNDC's ENSDF index shows the currently longest-lived adopted roentgenium dataset as Rg-282 with a 100-second alpha-decay record.

No production data
No reserves or end-use data
No price history
No isotope market data

Sources (6)

primary Element 111
GSI Helmholtzzentrum fur Schwerionenforschung • 1994 • retrieved 2026-04-13
primary Element 111 is named roentgenium
International Union of Pure and Applied Chemistry • 2004 • retrieved 2026-04-13
primary Name and symbol of the element with atomic number 111 (IUPAC Recommendations 2004)
International Union of Pure and Applied Chemistry • 2004 • retrieved 2026-04-13
primary Element 117 is synthesized
Joint Institute for Nuclear Research • 2010 • retrieved 2026-04-13
primary ENSDF references for 282Rg alpha decay (100 s)
National Nuclear Data Center, Brookhaven National Laboratory • 2019 • retrieved 2026-04-13
primary Index to ENSDF for A = 282
National Nuclear Data Center, Brookhaven National Laboratory • 2019 • retrieved 2026-04-13