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{{Infobox actinium}}
'''Actinium''' is a radioactive [[chemical element]] with symbol '''Ac''' (not to be confused with the abbreviation for an [[Acetyl| acetyl group]]) and has the [[atomic number]] 89, which was discovered in 1899. It was the first [[Primordial element|non-primordial radioactive element]] to be isolated. [[Polonium]], [[radium]] and [[radon]] were observed before actinium, but they were not isolated until 1902. Actinium gave the name to the [[actinide]] series, a group of 15 similar elements between actinium and [[lawrencium]] in the [[periodic table]].
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