| 11. | For alkali and alkaline earth metals the M + Ar 4 cluster is tetrahedral.
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| 12. | During this time the mine supplied most of the worldwide rare earth metals consumption.
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| 13. | The next two elements, alkali and alkaline earth metal respectively.
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| 14. | Why do the rare earth metals behave very chemically similar?
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| 15. | In general, the alkaline-earth metals form silicides with various stoichiometry.
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| 16. | For alkali and alkaline earth metals the M + Ne 4 cluster is tetrahedral.
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| 17. | Bastn�site ore is typically used to produce rare earth metals.
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| 18. | Later, it also started to extract rare earth metal oxides.
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| 19. | Gaseous radium chloride exists as RaCl 2 molecules, as with other alkaline earth metal halides.
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| 20. | Especially rare earth metals have been shown to reduce sintering of metal catalysts when alloyed.
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