lanthanoid (rare earth series), namely: lanthanum La57 鑭|镧[lan2], cerium Ce58 鈰|铈[shi4], praseodymium Pr59 鐠|镨[pu3], neodymium Nd60 釹|钕[nü3], promethium Pm61 鉕|钷[po3], samarium Sm62 釤|钐[shan1], europium Eu63 銪|铕[you3], gadolinium Gd64 釓|钆[ga2], terbium Tb65 鋱|铽[te4], dysprosium Dy66 鏑|镝[di1], holmium Ho67 鈥|钬[huo3], erbium Er68 鉺|铒[er3], thulium Tm69 銩|铥[diu1], ytterbium Yb70 鐿|镱[yi4], lutetium Lu71 鑥|镥[lu3]