| 21. | All of the non-radioactive lanthanides were detected in the stream, with the exception of thulium and lutetium.
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| 22. | Lanthanum continues the trend started by two lighter members in general chemical behavior, while lutetium behaves more similarly to yttrium.
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| 23. | The primary decay products before 174 Yb are isotopes of thulium, and the primary products after are isotopes of lutetium.
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| 24. | Lutetium Texaphyrin has passed the first safety tests of the government's required three-part trials for a new drug.
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| 25. | He chose the name lutecium for the new element, but in 1949 the spelling of element 71 was changed to lutetium.
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| 26. | Lutetium is not a particularly abundant element, although it is significantly more common than silver in the earth's crust.
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| 27. | Lutetium metal is slightly unstable in air at standard conditions, but it burns readily at 150 �C to form lutetium oxide.
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| 28. | Lutetium metal is slightly unstable in air at standard conditions, but it burns readily at 150 �C to form lutetium oxide.
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| 29. | Cerium-doped lutetium oxyorthosilicate ( LSO ) is currently the preferred compound for detectors in positron emission tomography ( PET ).
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| 30. | Chemically, scandium, yttrium and lutetium ( and presumably lawrencium ) behave like trivalent versions of the group 1 2 metals.
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