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第 20 章 f 区元素

第 20 章 f 区元素

第 20 章 f 区元素. 20.1 概述. 20.1.1 基本概念. ( n -2)f 0~14 ( n -1)d 0~1 n s 2. 20.1.2 镧系收缩 :. 镧系元素的原子 ( 离子 ) 半径 , 随着原子序数增大而缩小。. 1. 特点. 原子半径缩小缓慢,相邻元素递减 1pm ,总的缩小 约 14pm 。. 2. 结果. ( 1 ) Y 3+ 半径 88pm 落在 Er 3+ 88.1pm 附近, Y 进入稀土元素。 Sc 半径接近 Lu 3+ ,常与 Y 3+ 共生, Sc 也成为稀土元素。.

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