Seýrek ýer elementlerine lantan (La), seriý (Ce), praseodymium (Pr), neodiý (Nd), prometiý (Pm), samarium (Sm), ýewropium (Eu), gadolinium (Gd), terbium (Tb), disprozium girýär. (Dy), holmium (Ho), erbium (Er), tuliý (Tm), ýtterbium (Yb), lutetium (Lu), skandium (Sc) we yttrium (Y). Iňlis ...
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