Dictionary.com

Popular Searches

 Thesaurus.com

actinium series

American  

noun

Chemistry.

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

actinium series British  

noun

  1. 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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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 Project Gutenberg

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.