actinoids (rare earth series), namely: actinium Ac89 錒|锕[ā], thorium Th90 釷|钍[tǔ], protoactinium Pa91 鏷|镤[pú], uranium U92 鈾|铀[yóu], neptunium Ne93 鎿|镎[ná], plutonium Pu94 鈈|钚[bù], americium Am95 鎇|镅[méi], curium Cm96 鋦|锔[jú], berkelium Bk97 錇|锫[péi], californium Cf98 鐦|锎[kāi], einsteinium Es99 鎄|锿[āi], fermium Fm100 鐨|镄[fèi], mendelevium Md101 鍆|钔[mén], nobelium No102 鍩|锘[nuò], lawrencium Lr103 鐒|铹[láo]