Thulium
[θju:liәm]
Definition
(noun.) a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime.
Typist: Moira--From WordNet
Definition
(n.) A rare metallic element of uncertain properties and identity, said to have been found in the mineral gadolinite.
Inputed by Clara
Examples
- Samarium discovered by Boisbaudran, Scandium by Nilson, and Thulium by Cleve. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
Checked by Alissa