Aktinium
PubChem Notes:
Actinium Actinium. A trivalent radioactive element and the prototypical member of the actinide family. It has the atomic symbol Ac, atomic number 89, and atomic weight 227.0278. Its principal isotope is 227 and decays primarily by beta-emission.
MediLexicon AC - Medical Dictionary Definition for Term 'AC'
[1. Abbreviation for alternating current.
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