Rg
282.000Roentgenium
Röntgenyum
Roentgenium is a synthetic superheavy element with atomic number 111. It is predicted to be a Group 11 gold analog, with short-lived roentgenium-282 and chemistry shaped by relativistic effects.
111
282 g/mol
[Rn] 5f¹⁴ 6d¹⁰ 7s¹
2 | 8 | 18 | 32 | 32 | 18 | 1
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28.7 g/cm³
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GSI Darmstadt
Roentgenium was first synthesized at GSI Darmstadt in 1994 by bombarding bismuth-209 with nickel-64 ions. It is named after Wilhelm Conrad Röntgen, discoverer of X-rays and the first Nobel Prize winner in Physics.
Roentgenium-282
Half-life: About 100-130 seconds. Among the longest-lived known roentgenium isotopes; values vary by source and nuclear state.- Nuclear decay-chain research in superheavy elements
- Theoretical studies of Group 11 chemistry below gold
- Relativistic calculations of d-block superheavy elements
Roentgenium has no biological role. It is synthetic, extremely radioactive and produced only atom by atom.
- Roentgenium’s predicted electron configuration is source-dependent: RSC-style tables commonly list [Rn] 5f¹⁴ 6d¹⁰ 7s¹, while some databases list [Rn] 5f¹⁴ 6d⁹ 7s².
- No confirmed roentgenium compound has been chemically characterized yet.
- Its name connects modern superheavy element research with the discovery of X-rays.
- Roentgenium has atomic number 111 and symbol Rg.
- This data set lists roentgenium as [Rn] 5f¹⁴ 6d¹⁰ 7s¹, but superheavy-element predictions vary by source.
- Roentgenium is a predicted Group 11 transactinide below gold.
- Remember Rg-282 for the longest-lived roentgenium isotope range.
What is the atomic number of roentgenium?
The atomic number of roentgenium is 111.
What is the electron configuration of roentgenium?
This data set lists roentgenium with [Rn] 5f¹⁴ 6d¹⁰ 7s¹; some databases predict [Rn] 5f¹⁴ 6d⁹ 7s², so the value should be treated as predicted.
What is roentgenium used for?
Roentgenium has no commercial use; it is used only in nuclear physics and theoretical chemistry research.
Who is roentgenium named after?
Roentgenium is named after Wilhelm Conrad Röntgen, discoverer of X-rays.
What is roentgenium-282?
Roentgenium-282 is one of the longest-lived roentgenium isotopes, with a half-life around 100-130 seconds.