Selten Äerdelementer enthalen Lantan (La), Cerium (Ce), Praseodym (Pr), Neodym (Nd), Promethium (Pm), Samarium (Sm), Europium (Eu), Gadolinium (Gd), Terbium (Tb), Dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), scandium (Sc), an Yttrium (Y). The Eng...
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