69

Tm

Thulium
168.93421 (2)
 Historical Information

Per Theodor Cleve of Sweden discovered holmium in 1879 while working on erbia earth (erbium oxide). Thulium oxide (holmia) was present as an impurity in the erbia. The element is named after Thule, the ancient name for Scandinavia.
Basic Information Shells
  • Name:Thulium
  • Symbol: Tm
  • Atomic number: 69
  • Atomic weight:168.93421 (2)
  • Standard state: solid at 298 K
  • Group in periodic table:
  • Group name:Lanthanoid
  • Period in periodic table: 6
  • Block in periodic table: f-block
  • Classification: Metallic
 Thulium
Uses Trivia
  • alloys
  • natural thulium has possible use in ferrites (ceramic magnetic materials) used in microwave equipment

It is reasonably stable in air, but the metal must be protected from moisture. The element is silvery-grey, soft, malleable, and ductile, and can be cut with a knife. It is a rare earth metal found in minerals such as monazite.