thulium

Traductions

• anglais

  Date : 1983

  Définition

  An element. State: Solid; Group: IIIB (Lanthanide Series); Atomic No.: 69; Atomic Wt. 168.9342; Valence: 3; Isotopes: None stable 2 radioactive. Thulium, m.p. 1545 °C (2813 °F), is a minor element of the rare-earth group, occurring in association with yttrium in a number of ores such as xenotime and euxenite found in monazite sands. It is stable in air and reacts slowly with halogen elements at room temperature; it also forms compounds with oxygen, carbon, nitrogen, and hydrogen at high temperatures.

  Notes :

  It has few important uses; small pellets can be used as a portable source of diagnostic x-rays, and there is also as possibility of application in magnetic ceramic materials (ferrites).
  
  Named for thule, a legendary name for the most northerly part of the habitable world.

  Termes :

  1. thulium
  2. Tm

  [Tm] Symbol for the element thulium, named for Thule, a legendary name for the most northerly part of the habitable world.