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![Actinium - Wikipedia, the free encyclopedia](https://www.iarticlesnet.com/pub/img/site/s_11.jpeg)
Actinium - Wikipedia, the free encyclopedia
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日期:2024-08-07
Actinium is a radioactive chemical element with symbol Ac (not to be confused with the abbreviation for an acetyl group) and atomic number 89, which was discovered in 1899. It was the first non-primordial radioactive element to be isolated. Polonium, radi...看更多