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.
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roentgenium