Roentgenium (Rg) — Element Properties, Uses & Facts
Overview
Roentgenium is a chemical element with symbol Rg and atomic number 111. It is an extremely radioactive synthetic element (an element that can be created in a laboratory but is not found in nature); the most stable known isotope, roentgenium-282, has a half-life of 2.1 minutes. Roentgenium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion Research near Darmstadt, Germany.
Electron configuration
The electron configuration of Roentgenium is *[Rn] 5f14 6d10 7s1, with electron shells of 2, 8, 18, 32, 32, 17, 2.
Physical and chemical properties
Roentgenium is classified as a transition metal. It has an atomic mass of 282 and exists as a solid at standard conditions.
Real-world uses of Roentgenium
As a transition metal, Roentgenium is typically used in alloys, industrial manufacturing, electronics, or as a catalyst in chemical reactions.
Interesting facts about Roentgenium
- Roentgenium has the atomic number 111 and chemical symbol Rg.
- It belongs to period 7, group 11 of the periodic table.
- Roentgenium was discovered by Gesellschaft für Schwerionenforschung.
Explore Roentgenium interactively
Want to compare Roentgenium with other elements or see it highlighted on the full table? Open the interactive periodic table and click on Rg to explore properties, trends, and neighboring elements. You can also test your knowledge with our periodic table quiz game.
What is Roentgenium used for?
As a transition metal, Roentgenium is typically used in alloys, industrial manufacturing, electronics, or as a catalyst in chemical reactions.
What is the atomic number of Roentgenium?
The atomic number of Roentgenium is 111, meaning it has 111 protons in its nucleus.
What is the electron configuration of Roentgenium?
The electron configuration of Roentgenium is *[Rn] 5f14 6d10 7s1.
Is Roentgenium a metal, nonmetal, or metalloid?
Roentgenium is classified as a transition metal.