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/ækˈtɪniəm/ · noun
A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores..
Use actinium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Actinium means A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores..
Common synonyms include atomic number 89, ac.
The opposite depends on the specific sense.
Use actinium where its definition matches the intended context.
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