Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The radioactive isotope of actinium, 22789Ac, having a half-life of 21.7 years

Etymologies

From radio- +‎ actinium (Wiktionary)

Examples

  • Here he discovered radioactinium and conducted investigations with Rutherford on alpha-rays of radiothorium and radioactinium.

    Otto Hahn - Biography

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