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Pronunciation varies by accent · noun
(physics) The radioactive isotope of actinium, 22789Ac, having a half-life of 21.7 years.
Use radioactinium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Radioactinium means (physics) The radioactive isotope of actinium, 22789Ac, having a half-life of 21.7 years.
Common synonyms include actinium-227.
The opposite depends on the specific sense.
Use radioactinium where its definition matches the intended context.
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