| 11. | Most of the samples tested positive for actinium-227, the workers were told.
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| 12. | The actinium-225 eventually becomes harmless and remains in the body, he said.
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| 13. | The actinide series derives its name from the first element in the series, actinium.
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| 14. | The abundance of actinium in the Earth's crust is only about 5 %.
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| 15. | Actinium is likely to be one of two elements that will next recieve a picture.
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| 16. | Once inside, the alpha particles radiated from the actinium-225 will kill the cell.
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| 17. | Owing to its scarcity, high price and radioactivity, actinium has no significant industrial use.
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| 18. | The rare oxidation state + 2 is only known for actinium dihydride ( AcH 2 ).
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| 19. | The actinium-225 is made by the irradiation of radium-226 with a cyclotron.
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| 20. | In 1939, Perey discovered the element francium by purifying samples of lanthanum that contained actinium.
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