actinium series

actinium series

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

Origin:
1955–60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Actinium series is always a great word to know.
So is ethereal. Does it mean:
pertaining to, containing, or resembling ethyl ether
existing as free, uncombined atoms
Collins
World English Dictionary
actinium series
 
n
a radioactive decay series that starts with uranium-235 and ends with lead-207

Collins English Dictionary - Complete & Unabridged 10th Edition
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