| 21. | You can lay the radium problem at the feet of Mother Nature.
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| 22. | Pierre worked with his wife in isolating polonium and radium.
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| 23. | Radium chloride ( RaCl 2 ) is a colorless, luminous compound.
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| 24. | In water, it is more soluble than radium chloride.
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| 25. | From the 1960s the use of radium paint was discontinued.
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| 26. | Some of the biological effects of radium were apparent from the start.
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| 27. | He was one of the first to use radium to treat cancer.
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| 28. | Radium chloride Ra 223 is one of the most potent drugs known.
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| 29. | The other is, which is colorless and contains radium and carbonate.
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| 30. | The emission of alpha particles by the radium was responsible.
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