π bond is an important concept in the molecular structure. The problem how to judge the kinds of π bonds in homonuclear molecules or ions in Inorganic Chemistry, Organic Chemistry and Structural Chemistry is worthy of studying. In the present paper, a method about judging the kinds of πbonds in homonuclear molecules or ions was introduced.% π键是分子结构中的重要概念。如何到断分子中是否含有π键及其类型是无机化学、有机化学和结构化学中的一个值得研究的问题。本文介绍一种如何判断单核小分子或离子中的π键类型的方法。
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