双语例句原声例句
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These elements, unlike the transition elements, do not exhibit variable oxidation states, and their valence electrons are only present in their outer shell.
这些元素，不像过渡金属那样显示出可变的化合价，他们只有最外层电子参加反应。
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Step three in our Lewis structure rules is to figure out how many electrons we would need in order for every single atom in our molecule to have a full valence shell.
路易斯结构规则的第三步是，找出让分子中每个原子的价壳层，都排满应该需要多少个价电子。
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Halogen atoms contain seven electrons in their valence shell, and, consequently, are monovalent.
卤原子在它们的价电子层含有七个电子，因此是一价的。
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The reason is because we already have a full valence shell for our hydrogen, it doesn't want any more electrons.
原因是因为我们的氢,已经有一个排满的价壳层了，它不再需要多余的电子了。
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Step three in our Lewis structure rules is to figure out how many electrons we would need in order for every single atom in our molecule to have a full valence shell.
路易斯结构规则的第三步是,找出让分子中每个原子的价壳层,都排满应该需要多少个价电子。
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And, these outer shell electrons are termed valence electrons.
这些外层电子被,称作价电子。
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