1lanthanoid (rare earth series), namely: lanthanum La57 镧|镧, cerium Ce58 鈰|铈, praseodymium Pr59 鐠|镨, neodymium Nd60 釹|钕, promethium Pm61 鉕|钷, samarium Sm62 釤|钐, europium Eu63 銪|铕, gadolinium Gd64 釓|钆, terbium Tb65 鋱|铽, dysprosium Dy66 镝|镝, holmium Ho67 鈥|钬, erbium Er68 鉺|铒, thulium Tm69 銩|铥, ytterbium Yb70 鐿|镱, lutetium Lu71 鑥|镥