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The symbol for the element actinium.


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Ac, symbol for the element actinium.



The symbol for the element actinium.

Chemical symbol, actinium.

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
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