在原子与一个以上的电子处理，需要对斥力的影响考虑，对轨道渗透核屏蔽，和一个额外的量子数的指定在任何轨道电子内在能量。所有这些考虑是必要的，使施工的元素周期分类的现代形式。
—from Structure and Bonding (Basic Concepts in Chemistry) (结构和成键（基本概念，化学）), a book by Jack Barrett
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