Roentgenium
unknown, probably transition metal · period 7 · group 11 (coinage metals) · d-block
Roentgenium is a chemical element with the symbol Rg and atomic number 111. It is an extremely radioactive synthetic element that can be created in a laboratory but is not found in nature.
What the numbers say
At standard temperature and pressure Roentgenium is a solid, sitting in period 7, group 11 of the d-block.
First identified in 1994.
Check it against computed structures
The structure search queries the Materials Project, OQMD and the Open Materials Database for computed crystal structures containing Rg — with DFT formation energy, hull stability and band gap where the provider publishes them.
K 2 · L 8 · M 18 · N 32 · O 32 · P 18 · Q 1
Properties
| Atomic number | 111 |
|---|---|
| Atomic mass | 282 u |
| Series | unknown, probably transition metal |
| Group | 11 |
| Period | 7 |
| Block | d-block |
| Phase at STP | Solid |
| Electron configuration | *[Rn] 5f¹⁴ 6d¹⁰ 7s¹ |
| Discovered | 1994 |
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See Rg in context with all 118 elements.
Working with roentgenium in a real design?
Ask the materials chat how Rg behaves in your alloy system, what it does to weldability, and which grades to look at — with the source of every number named.