| 21. | Like most rare earth elements, praseodymium most readily forms trivalent Pr ( III ) ions.
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| 22. | Thorium has been produced in excess of demand from the refining of rare earth elements.
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| 23. | Zirconium, calcium, and rare earth elements are added for sulfide-inclusion shape control which increases formability.
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| 24. | Neodymium metal, one of the rare earth elements, is the primary raw material in neo powder.
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| 25. | The rare earth elements are often found together.
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| 26. | Thorium hydroxide is dissolved in an inorganic acid and then purified from the rare earth elements.
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| 27. | Rare earth elements patterns may also be used.
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| 28. | In the original draft of the book I had three chapters on the rare earth elements.
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| 29. | Later it was shown that decipium was a mixture of samarium and other rare earth elements.
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| 30. | Sinopac is engaged in development and production of rare earth elements ( REE ) in Africa.
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