Roentgenium

Document v1 · published by Koskamo · updated 2026-10-04

Roentgenium (Rg) is chemical element 111, a transition metal in group 11, period 7 (PubChem).

Atomic number: 111
Symbol: Rg
Group: 11
Period: 7
Atomic mass: 282.169 u
Electron configuration: [Rn]7s2 5f14 6d9 (predicted)
Oxidation states: 5, 3, 1, -1
Standard state: Expected to be a Solid
Chemical group: Transition metal
Year discovered: 1994

Source and provenance

Original source: pubchem.ncbi.nlm.nih.gov
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: PubChem periodic table data (NIH/NLM, pubchem.ncbi.nlm.nih.gov/ptable); group and period from Jefferson Lab via PubChem

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Version history

Published by Koskamo2026-10-04
Version 1