lanthanoid (rare earth series), namely: lanthanum La57 鑭|镧[lán], cerium Ce58 鈰|铈[shì], praseodymium Pr59 鐠|镨[pǔ], neodymium Nd60 釹|钕[nǚ], promethium Pm61 鉕|钷[pǒ], samarium Sm62 釤|钐[shān], europium Eu63 銪|铕[yǒu], gadolinium Gd64 釓|钆[gá], terbium Tb65 鋱|铽[tè], dysprosium Dy66 鏑|镝[dī], holmium Ho67 鈥|钬[huǒ], erbium Er68 鉺|铒[ěr], thulium Tm69 銩|铥[diū], ytterbium Yb70 鐿|镱[yì], lutetium Lu71 鑥|镥[lǔ]