What is Tm? Important knowledge about Tm.

1. Definition of Tm

Tm, or Thulium, is a chemical element with the symbol Tm and atomic number 69. It is a soft, silver-colored transition metal and belongs to the lanthanide group of the periodic table. The English name for Tm is Thulium. The atomic mass of Tm is 168.93421(2) u. The relative atomic mass of Thulium is 168.9342. In terms of molecular structure, Thulium almost does not exist as a natural molecule. Thulium forms ions with the principal state being Tm₃+.

2. Properties of Tm

2.1 Physical properties of Tm
Thulium exists as a solid at room temperature. The color of Thulium is silver. As a metal, Thulium does not have a smell. The pH of Thulium is not determined as it is a metal and is insoluble in water.
2.2 Chemical properties of Tm
Thulium is quite stable in the air. However, it can be gradually oxidized when the temperature increases.

3. Common chemical equations of Tm
   Thulium can react with strong oxidants such as halogens, concentrated acids to form Tm₃+ salts.

4. Synthesis of Tm

4.1 Laboratory synthesis of Tm
Thulium cannot be synthesized in a regular laboratory because the synthesis process is quite complex and requires specialized methods.
4.2 Industrial synthesis of Tm
Thulium is synthesized from mineral sources containing lanthanides such as monazite. The process includes many steps of refining, including separation, substance breakdown and purification.