GUESS ELEMENTFREE CHEMISTRY QUIZ
69 Tm ATOMIC MASS 168.93

ELEMENT 69 · LANTHANIDE

Thulium (Tm)

Thulium is a scarce lanthanide used in portable radiation sources, specialised lasers, and scientific materials.

Atomic number
69
Category
Lanthanide
Period
6
Group
f-block
State
Solid

Fun facts about Thulium

  • Irradiated thulium can provide a compact source of X-rays.
  • Thulium-doped lasers emit useful near-infrared wavelengths.
  • It commonly occurs only as a minor component of rare-earth minerals.

Common uses of Thulium

  • Specialised lasers
  • Portable X-ray sources
  • Research

Where Thulium sits in the periodic table

Thulium belongs to the lanthanide series in period 6 and the f-block of the periodic table. Under the conditions represented in this reference, its state is solid.

Quick chemistry revision

For quick revision, pair the symbol Tm with atomic number 69 and the listed atomic mass 168.93. The summary, facts, and uses above keep those element properties together in one reference.