Actinium
| Date Released: |
|
|
Nov. 05, 1999 |
actinium n. Chem. radioactive metallic element found in pitchblende. [as *actinism] |
Actinium | Date Released: |
|
|
Nov. 05, 1999 |
actinium n. Chem. radioactive metallic element found in pitchblende. [as *actinism] |