Rare earth elements are a set of 17 chemical elements in the periodic table, specifically 15 lanthanides (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium) as well as scandium and yttrium.
Unter den Seltenen Erden versteht man 17 chemische Elemente des Periodensystems, nämlich die 15 Lanthanoide (Lanthan, Cer, Praseodym, Neodym, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium und Lutetium) sowie die Elemente Scandium und Yttrium.