八隅规则
性质：又称八隅律。分子中两个相连的原子可以共有一对或多电子，以便达到惰性气体原子的电子构型，从而形成稳定分子。这种构想叫做八隅规则。这种具有稳定的惰性气体原子构型的结构，当时用电子排布在立方体的八个角上，因而叫八隅体（octet）,后来简化了。如Cl2。
The octet rule is a simple chemical rule of thumb that states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas. The rule is applicable to the main-group elements, especially carbon, nitrogen, oxygen, and the halogens, but also to metals such as sodium or magnesium. In simple terms, molecules or ions tend to be most stable when the outermost electron shells of their constituent atoms contain eight electrons.
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