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

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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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Example sentences
These are the uranium series, the thorium series, and the actinium series.
The majority of these can be grouped into the uranium series, the actinium series, and the thorium series.
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