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