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Except for the transitional elements, valency electrons are in the outermost electron shell.
除去过渡元素外, 价电子位于最外面的电子层.
辞典例句
"the chemical properties of an atom are determined by the outermost electron shell"
英汉双解词典包含4367426条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。