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thulium
[ thoo-lee-uhm ]
noun
, Chemistry.
- a rare-earth metallic element found in the minerals euxenite, gadolinite, etc. : Tm; : 168.934; : 69; : 9.32.
thulium
/ ˈθjuːlɪəm /
noun
- a malleable ductile silvery-grey element occurring principally in monazite. The radioisotope thulium-170 is used as an electron source in portable X-ray units. Symbol: Tm; atomic no: 69; atomic wt: 168.93421; valency: 3; relative density: 9.321; melting pt: 1545°C; boiling pt: 1950°C
thulium
/ tho̅o̅′lē-əm /
- A soft, silver-gray metallic element of the lanthanide series. One of its artificial radioactive isotopes is used as a radiation source in small, portable x-ray machines. Atomic number 69; atomic weight 168.934; melting point 1,545°C; boiling point 1,727°C; specific gravity 9.3; valence 2, 3.
- See Periodic Table
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Word History and Origins
Discover More
Word History and Origins
Origin of thulium1
C19: New Latin, from Thule + -ium
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