actinium series

American

noun

Chemistry.

the radioactive series that starts with uranium 235 and ends with a stable isotope of lead of mass number 207.

actinium series British

noun

a radioactive decay series that starts with uranium-235 and ends with lead-207

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of actinium series

First recorded in 1955–60

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actinium series

The end product of the actinium series is also an element resembling lead, but both the beginning and ending of this series are still in obscurity.

From A Brief Account of Radio-activity by Venable, Francis Preston

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023