Europium

**Definition:** An element of the rare earth family of metals. It has the atomic symbol Eu, atomic number 63, and atomic weight 152. Europium is used in the form of its salts as coatings for cathode ray tubes and in the form of its organic derivatives as shift reagents in NMR spectroscopy.

**Tree numbers:** - D01.268.558.362.468 - D01.552.550.399.468