| 21. | Actinium also has two meta states.
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| 22. | The major difficulty in separation of actinium is the similarity of its properties with those of lanthanum.
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| 23. | Update : I think the actinium that the site sells is actually a compound ( nitrate ).
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| 24. | All but two tested positive for actinium-227, the radioactive isotope the workers were cleaning up.
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| 25. | It is the ninth product of the neptunium decay series as a daughter isotope of actinium-225.
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| 26. | Actinium can be made in reasonable amounts, and has a decent half-life of 21 years.
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| 27. | Sullivan said actinium-227 tends to accumulate in the liver, but he downplayed the potential health risk.
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| 28. | Protactinium is more abundant ( 10 " 12 % ) in the Earth's crust than actinium.
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| 29. | Thus actinium is either synthesized in nuclear reactions from isotopes of radium or separated using ion-exchange procedures.
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| 30. | Chemically, actinium is similar to lanthanum, which is explained by their similar ionic radii and electronic structure.
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