lutecium

The two compounds they discovered were neoytterbium and lutecium.

He chose the name lutecium for the new element but in 1949 the spelling of element 71 was changed to lutetium.

The scientists proposed different names for the elements: Urbain chose neoytterbium and lutecium, while Welsbach chose aldebaranium and cassiopeium.

In 1907, the new earth "lutecia" was separated from ytterbia, from which the element "lutecium" (now lutetium) was extracted by Georges Urbain, Carl Auer von Welsbach, and Charles James.