// MATTER · ELEMENT 111 / 118atoms.no/elements
Rg111
Roentgenium
Rg·Z 111·Unknown·282·⭕ 10B · D Major
▸ The reading
interpretive · artRoentgenium honours Wilhelm Röntgen, whose X-rays became the very technique by which superheavy atoms are identified — element 111 is named for the tool that proves such elements exist at all. Predicted to sit in gold's group, unconfirmed. The discoverer of the light that reads the table, written into it.
The science below is cited as science; the symbolic layers are flagged as interactive art.
⚜ Periodic Frequency
10BD Major
a seat struck in brass — testimony, not prediction
the seat has its own room on ⭕ THE OVAL TABLE — tap the code
▸ The lenses
▸ Discovery
Sigurd Hofmann + colleagues at GSI Darmstadt · Germany · 1994
▸ Stellar origin
Human-madeGroup-11 transactinide. Longest-lived isotope ²⁸²Rg has a half-life of about two minutes.
▸ Reactivity
Predicted to be a gold-group transition metalRelativistic effects in row 7 are predicted to make Rg behave less like gold and more like a heavier homologue — relativistic contraction may stabilize unusual oxidation states.
▸ Applications
- Heavy-element synthesis research
- (No commercial applications)
- (No practical bulk uses)
- (No medical uses)
▸ Curiosity
Named for Wilhelm Conrad Röntgen, who discovered X-rays in 1895 — the technique that underwrites nearly every spectroscopic identification of new heavy elements.
▸ Related readings
a resonance drawn between readings — not a claim that they share an origin.
Group 11AuGold
Period 7DsDarmstadtiumCnCopernicium
d-blockDsDarmstadtiumCnCopernicium
Adjacent ZDsDarmstadtiumCnCopernicium