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本文介绍了根据原子电子层数与最外层电子数的相对差值判断元素属性的经验规则及其应用。重点讨论了原子电子层数与实际提供的价电子数的相对差值，对元素氧化物及其水合物的酸性、两性、碱性的影响关系，为粗略地判断各种元素的不同价态氧化物、水合物的酸碱性相对强弱提供了一条简易的经验规则。从而探索元素周期表的教学方法。
This paper introduces the rule of thumb and its application for judging the attributes of elements based on the relative difference between the number of atomic electrons and the number of outermost electrons. The relative differences between the number of atomic electrons and the number of valence electrons actually provided are discussed. The influences of the acid, amphoteric, and basic properties of the elemental oxides and their hydrates are roughly discussed in order to roughly determine the valence oxidation of various elements. The relatively strong acidity and alkalinity of substances and hydrates provides a simple rule of thumb. In order to explore the teaching method of the periodic table.