Rg
111 unknown, probably transition metal Generated with AI
Roentgenium
Symbol Rg
Atomic Mass 282
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.
Properties
- Phase: Solid
- Density: 28.7 g/cm³
- Melting Point: null K
- Boiling Point: null K