actinium series

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

noun

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

Word History and Origins

Origin of actinium series¹

First recorded in 1955–60

Example Sentences

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