actinium means A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores. Lexicurio rates it Rare gem — a strength score of 83 out of 100.
actinium is pronounced /ækˈtɪniəm/.
noun
- A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.