| 1. | Like all rare earth metals, cerium is of low to moderate toxicity.
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| 2. | It banned the export of gold, vanadium, titanium, and rare earth metals.
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| 3. | Kyrgyzstan has significant deposits of metals including gold and rare earth metals.
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| 4. | The alkali metals and the alkaline earth metals all form saline hydrides.
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| 5. | North Korea has been reported to have sold rare earth metals to China.
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| 6. | Examples of reducing agents include the earth metals, formic acid, and sulfite compounds.
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| 7. | MgFeSi contains 3 42 % magnesium and small amounts of rare earth metals.
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| 8. | Where present, rare earth metals tend to associate with phosphate minerals.
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| 9. | From strontium onward, the alkali earth metals become denser with increasing atomic mass.
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| 10. | Calcium is a soft gray Group 2 alkaline earth metal, crust.
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