Scandium (Sc), yttrium (Y), and lanthanide metals Lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), DR (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), 17 metal collectively.

rare earth metals introduce.doc

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