锕系元素 | [ā xì yuán sù, ㄚ ㄒㄧˋ ㄩㄢˊ ㄙㄨˋ, 锕系元素 / 錒系元素] actinoids (rare earth series), namely: actinium Ac89 錒|锕, thorium Th90 釷|钍, protoactinium Pa91 鏷|镤, uranium U92 鈾|铀, neptunium Ne93 镎|镎, plutonium Pu94 鈈|钚, americium Am95 镅|镅, curium Cm96 鋦|锔, berkelium Bk97 錇|锫, californium Cf98 鐦|锎, einsteinium Es99 鎄| |
稀土 | [xī tǔ, ㄒㄧ ㄊㄨˇ, 稀土] rare earth (chem.) |
稀土元素 | [xī tǔ yuán sù, ㄒㄧ ㄊㄨˇ ㄩㄢˊ ㄙㄨˋ, 稀土元素] rare earth (chem.) |
稀土金属 | [xī tǔ jīn shǔ, ㄒㄧ ㄊㄨˇ ㄐㄧㄣ ㄕㄨˇ, 稀土金属 / 稀土金屬] rare earth element |
镧系元素 | [lán xì yuán sù, ㄌㄢˊ ㄒㄧˋ ㄩㄢˊ ㄙㄨˋ, 镧系元素] lanthanoid (rare earth series), namely: lanthanum La57 鑭|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 鏑|镝, holmium Ho67 鈥|钬 |