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If we look at this configuration, what we say is all of the electrons in these inner shells are what we call core electrons.
如果我们看到这个构型，我们所说的是,所有的内层,都是核电子。
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And I want to point out the difference between core electrons and valence electrons here.
我想指出的是,核电子和价电子,之间的区别。
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The total negative charge of the electrons is equal to the positive charge of the nucleus.
所有电子的负电荷,等于核的正电荷。
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The core electrons tend not to be involved in much chemistry in bonding or in reactions.
核电子倾向于不参与结合,或者反应。
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And, it involves a single electron orbiting a positively charged nucleus.
包含了一个单独的电子轨道,一个带正电荷的核。
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We have a helium nucleus and one electron.
我们有一个氦核和一个电子。
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All the electrons fall into the nucleus.
所有的电子会掉在核上面。
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And, I've got 18 electrons around it.
核外有18个电子。
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Because already I can see there is a line of sight from one nucleus to the other with no electron density whatsoever.
因为我已经看出在Z轴,有一条线从这个核到那个核,没有连续电子。
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