actinide series

noun Chemistry.
the series of radioactive elements that starts with actinium and ends with lawrencium.

1940–45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
actinide series
a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The actinide series derives its name from the first element in the series, actinium.
Systematic view of optical absorption spectra in the actinide series loading.
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