What is a metallic element separated from ytterbium in 1907, by Urbain in Paris and by von Welsbach in Vienna. Symbol, Lu; at. wt. 174.0 called?

lutecium — A metallic element separated from ytterbium in 1907, by Urbain in Paris and by von Welsbach in Vienna. Symbol, Lu; at. wt. 174.0. (Webster's 1913.)

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