KnowraLutetiumLinked fromLinked fromThe 4 pages that link to Lutetium, each with the reason it gives.All 4Broader topic 3Compared with 1LanthanideBroader topic: Its position marks the series’ endpoint in definitions running from lanthanum through lutetium.Carl Auer von WelsbachBroader topic: Auer named this element cassiopeium after separating it from ytterbium.Group 3 elementBroader topic: Some periodic-table conventions place it below yttrium in Group 3.