thorium series

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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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thorium series

physics

Also known as: 4n series

Written and fact-checked by The Editors of Encyclopaedia Britannica

Article History

Related Topics:: radioactive series; thorium

thorium series, set of unstable heavy nuclei comprising one of the four radioactive series.

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