Usually means: Obsolete name for actinium isotope.
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We found 5 dictionaries that define the word radioactinium:

General (4 matching dictionaries)
  1. radioactinium: Merriam-Webster
  2. radioactinium: Wiktionary
  3. radioactinium: Infoplease Dictionary
  4. radioactinium: Dictionary.com

Computing (1 matching dictionary)
  1. radioactinium: Encyclopedia

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Definitions from Wiktionary (radioactinium)

▸ noun:  (physics) The radioactive isotope of actinium, ²²⁷₈₉Ac, having a half-life of 21.7 years

Similar:
RdAc, relative atomic mass, RRAT, Act., ara-C, at. wt., ARRT, RCSA, triga, A.C.T., more...

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Similar:
RdAc, relative atomic mass, RRAT, Act., ara-C, at. wt., ARRT, RCSA, triga, A.C.T., more...



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