roentgenium
noun /ˌrɒntˈɡiːniəm/
/ˌrentˈɡiːniəm/
[uncountable] (symbol Rg)
- a chemical element. Roentgenium is a radioactive element that is produced artificially and has no known use.
- the discovery and naming of roentgenium
- Roentgenium has no stable isotopes.