| 11. | Lanthanum is the least volatile of the lanthanides.
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| 12. | Indeed, lanthanum is a strongly electropositive metal, comparable to calcium in electropositivity.
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| 13. | Like most of the lanthanides, lanthanum has a hexagonal crystal structure at room temperature.
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| 14. | Lanthanum is not essential for humans and has a low to moderate level of toxicity.
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| 15. | Lanthanum was also first discovered in minerals from Bastn�s in 1839 by Carl Gustav Mosander.
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| 16. | Initially, a phosphate process was used, where lanthanum was precipitated as lanthanum phosphate.
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| 17. | Initially, a phosphate process was used, where lanthanum was precipitated as lanthanum phosphate.
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| 18. | Bonding is ionic with lanthanum highly coordinated.
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| 19. | Looking for a diagram that shows the local coordination environment in the lanthanum trifluoride structure.
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| 20. | They are termed lanthanides because the lighter elements in the series are chemically similar to lanthanum.
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