錒系元素 [ㄚ ㄒㄧˋ ㄩㄢˊ ㄙㄨˋ; a1 xi4 yuan2 su4]
actinoids (rare earth series), namely: actinium Ac89 錒[ㄚ; a1], thorium Th90 釷[ㄊㄨˇ; tu3], protoactinium Pa91 鏷[ㄆㄨˊ; pu2], uranium U92 鈾[ㄧㄡˊ; you2], neptunium Ne93 鎿[ㄋㄚˊ; na2], plutonium Pu94 鈈[ㄅㄨˋ; bu4], americium Am95 鎇[ㄇㄟˊ; mei2], curium Cm96 鋦[ㄐㄩˊ; ju2], berkelium Bk97 錇[ㄆㄟˊ; pei2], californium Cf98 鐦[ㄎㄞ; kai1], einsteinium Es99 鎄[ㄞ; ai1], fermium Fm100 鐨[ㄈㄟˋ; fei4], mendelevium Md101 鍆[ㄇㄣˊ; men2], nobelium No102 鍩[ㄋㄨㄛˋ; nuo4], lawrencium Lr103 鐒[ㄌㄠˊ; lao2]
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