| 21. | Polonium is named after Marie Curie's country of birth, Poland.
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| 22. | The United States is the largest consumer of polonium.
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| 23. | Some of polonium's applications relate to the element's radioactivity.
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| 24. | Polonium alloyed with beryllium provides an efficient neutron source.
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| 25. | Much of the basic physics of polonium was classified until after the war.
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| 26. | The most important of these are polonium-210.
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| 27. | The idea was to simply roast the lead dioxide and vaporize the polonium.
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| 28. | This means that Litvinenko could not have been the source of the polonium.
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| 29. | However, no salts from polonium hydride are known.
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| 30. | Like selenium tetrachloride and tellurium tetrachloride, polonium tetrachloride forms and halogen complexes.
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