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actinium series
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actinium series The four radioactive series of chemical elements: (from top) the uranium series, the neptunium series, the thorium series, and the actinium series.
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actinium series

nuclear physics
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actinium series
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Category: Science & Tech
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radioactive series

actinium series, set of unstable heavy nuclei constituting one of the four radioactive series.

This article was most recently revised and updated by Erik Gregersen.