And, this outermost shell is termed the valence shell.
这个最外层被称作价电子层。
The outermost shell of the atmosphere, between the mesosphere and outer space, where temperatures increase steadily with altitude.
热大气层，热电离层：大气层介于中间层和外层空间之间的最外一层，在这一层中温度随高度而稳定增加。
Elements in the first column all have one electron in their outermost shell. Those in the second column have two outer electrons, and so on.
第一列元素最外电子层内均有一个电子，第二列元素则含有两个电子，依此类推。
Elements in the first column all have one electron in their outermost shell. Those in the second column have two outer electrons, and so on.
第一列元素最外电子层内均有一个电子，第二列元素则含有两个电子，依此类推。
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