这个最外层被称作价电子层。

And, this outermost shell is termed the valence shell.

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卤原子在它们的价电子层含有七个电子，因此是一价的。

Halogen atoms contain seven electrons in their valence shell, and, consequently, are monovalent.

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在原子价电子层结构的基础上提出了原子结构半径和键参数的概念，并利用键参数研究碱金属卤化物晶格焓。

This article makes a detailed analysis of the definition of atomic radius and ionic radius, so that the two terms can be well understood and used in the course of teaching.

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在原子价电子层结构的基础上提出了原子结构半径和键参数的概念，并利用键参数研究碱金属卤化物晶格焓。

This article makes a detailed analysis of the definition of atomic radius and ionic radius, so that the two terms can be well understood and used in the course of teaching.

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