Thulium(III) chloride or thulium trichloride is as an inorganic salt composed of thulium and

chlorine Chlorine is a chemical element with the symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine i ...

with the

formula In science, a formula is a concise way of expressing information symbolically, as in a mathematical formula or a ''chemical formula''. The informal use of the term ''formula'' in science refers to the general construct of a relationship betwe ...

TmCl₃. It forms yellow crystals. Thulium(III) chloride has the YCl₃ ( AlCl₃) layer structure with octahedral thulium ions.Wells A.F. (1984) ''Structural Inorganic Chemistry'' 5th edition Oxford Science Publications

Reactions

The hydrated form of thulium(III) chloride can be obtained by adding thulium(III) oxide to concentrated

hydrochloric acid Hydrochloric acid, also known as muriatic acid, is an aqueous solution of hydrogen chloride. It is a colorless solution with a distinctive pungent smell. It is classified as a strong acid. It is a component of the gastric acid in the dige ...

. Thulium(III) chloride reacts with strong bases to make thulium(III) oxide.

References

Thulium compounds Chlorides Lanthanide halides {{inorganic-compound-stub