Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics The
radioactive isotope ofactinium , 22789Ac, having ahalf-life of 21.7 years
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
From radio- + actinium
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Examples
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Here he discovered radioactinium and conducted investigations with Rutherford on alpha-rays of radiothorium and radioactinium.
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