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第三周期元素具有与价层轨道能量相近的３ｄ空轨道，因此给这些元素及其化合物带来许多特殊性质．本文归纳了它们的特殊性、规律性，提出３ｄ轨道效应，并对其应用作了初步总结
The third periodic element has a 3d empty orbit close to the valence orbit energy and therefore brings many special properties to these elements and their compounds. This article summarizes their particularity and regularity, puts forward the 3d orbit effect, and makes a preliminary summary of its application