111Rg
Element 111
Roentgenium
Transition metals
Roentgenium is a chemical element with symbol Rg and atomic number 111.
Key data
- Atomic number
- 111
- Atomic mass
- 282.000 u
- Group / Period
- 11 / 7
- Block
- d-block
- Phase at STP
- Solid
- Density
- 28.7 g/cm³
- Melting point
- —
- Boiling point
- —
- Electron configuration
- *[Rn] 5f14 6d10 7s1
Common uses
- •Research only
- •Named after Wilhelm Röntgen
- •Synthesized 1994
Discovery
Year: 1994
Discovered by: Gesellschaft für Schwerionenforschung
Frequently asked questions
What is the atomic number of Roentgenium?
Roentgenium has atomic number 111. Its symbol is Rg and its atomic mass is 282 u.
What category of element is Roentgenium?
Roentgenium is classified as transition metals. It sits in group 11, period 7 of the periodic table.
What is Roentgenium used for?
Common uses of Roentgenium include: Research only, Named after Wilhelm Röntgen, Synthesized 1994.
When was Roentgenium discovered?
Roentgenium was discovered in 1994 by Gesellschaft für Schwerionenforschung.
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