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Actinium

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ELEMENT
actinium
Symbol
(Terran)
Ac
Atomic number 89
Atomic weight (227)*
*most stable form

Actinium (abbreviated Ac) is a chemical element. Actinium is element number 89 on the periodic table. This element was discovered in 1899 by Humans, in France on Earth. This element is the first of the actinide series of heavy elements. (ST reference: Star Fleet Medical Reference Manual)

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