| 41. | Strontium and barium do not have as many applications as the lighter alkaline earth metals, but still have uses.
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| 42. | During May and June 2014, North Korea sold over US $ 1.88 million worth of rare earth metals to China.
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| 43. | Radium oxide ( RaO ) has not been characterized, despite oxides being common compounds for the other alkaline earth metals.
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| 44. | Another Austrian company named in the report, Treibacher Werke, made to Iraq apparently one shipment of rare-earth metals in the 1980s.
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| 45. | Another Austrian company named in the report, Treibacher Werke, apparently made to Iraq one shipment of rare-earth metals in the 1980s.
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| 46. | 6 . Thermodynamic studies on the complexation processes between some amino acids and some rare earth metal ions in aqueous solution.
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| 47. | It reacts violently with alkali metals and white phosphorus at room temperature and less violently with alkali earth metals heavier than magnesium.
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| 48. | While ineffective when used on alkali or earth metals, vacuum fusion remains a viable means when applied to almost all other metals.
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| 49. | On 4 April 2011, the American rare earth metal producer Molycorp announced its acquisition of a 90 % stake in AS Silmet.
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| 50. | Earths are metallic oxides, and the corresponding metals were classified into the corresponding groups : rare earth metals and alkaline earth metals.
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