Actinium
| Definition: |
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. |
| Notes: |
naturally radioactive; IM |
| CAS Type 1 Name: |
CAS Number: |
7440-34-8 |
Actinium Definitions and Terms
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