從國二理化開始到高中化學,我們都在講週期表。但是主要討論的是左右兩邊的元素,對於周期表中間的過渡元素討論的甚少;稀土族元素更少。稀土族元素指的是原子序 57 的鑭 (lanthanum) 到 71 鎦 (lutetium) 的15個元素。
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