| 21. | About 10 % of the lanthanide contraction has been attributed to relativistic effects.
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| 22. | Lutetium is the hardest and densest lanthanide and has the highest melting point.
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| 23. | Hydrides in the transition metals and lanthanides are also typically polymeric covalent hydrides.
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| 24. | Like the lanthanides, the actinides form a family of elements with similar properties.
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| 25. | Lanthanum is the least volatile of the lanthanides.
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| 26. | Samarium is one of the few lanthanides that exhibit the oxidation state + 2.
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| 27. | Without the lanthanide contraction, a chemical separation of lanthanides would be extremely difficult.
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| 28. | Without the lanthanide contraction, a chemical separation of lanthanides would be extremely difficult.
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| 29. | This behavior is known as the lanthanide contraction.
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| 30. | Homogeneous assays rely on direct coupling of the lanthanide label with an organic acceptor.
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