| 21. | Eriochrome Black T has also been used to detect the presence of rare earth metals.
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| 22. | Pieces of rare earth metal which was discovered as an impurity in the mineral ytterbia.
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| 23. | All the discovered alkaline earth metals occur in nature.
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| 24. | The name " didymium " continued to be used in the rare earth metal industry.
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| 25. | The alkaline earth metals form difluorides that are insoluble.
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| 26. | In southern Ukraine, he found rare-earth metals beneath what would become the city of Samotkan.
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| 27. | Similar to yttrium, rare-earth metals from Gd to Lu can form REB 41 Si 1.2-type boride.
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| 28. | This reflected the belief at that time that thorium and the rare earth metals were divalent.
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| 29. | While most metals form arsenides, only the alkali and alkaline earth metals form mostly ionic arsenides.
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| 30. | The cathode is coated with oxides of alkaline earth metals, such as barium and strontium oxides.
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