现在大家都知道元素的性质主要取决于元素原子的最外层能级的电子数目。

It is now known that properties of an element depend mainly on the number of electrons in the outermost energy level of the atoms of the element.

youdao

这是因为在后者的情况下，参与辐射的电子数目减少并且反向激波本身受到了抑制。

This is because in the highly magnetized case, the total number of electrons involved in the emission decreases and the strength of the reverse shock has been suppressed.

youdao

光电倍增管有一个对光敏感的阴极，它发射的电子数目与撞击到其上面的光子数量成正比。

The tube consists of a light-sensitive cathode that emits electrons in proportion to the photons striking it.

youdao

So, electron promotion does not happen in terms of nitrogen, because it would not increased our number of unpaired electrons.

这里对于氮原子不会有电子激发，因为这不会增加,未配对电子的数目。

麻省理工公开课 - 化学原理课程节选

The way that we can figure this out is using something called bond order, and bond order is equal to 1/2 times the number of bonding electrons, minus the number of anti-bonding electrons.

我们可以用叫做,键序的概念来弄明白它，键序等于1/2乘以成键电子,数目减去反键电子数目。

麻省理工公开课 - 化学原理课程节选

So you can see that we're starting to have a very complicated equation, and it turns out that it's mathematically impossible to even solve the exact Schrodinger equation as we move up to higher numbers of electrons.

所有你们可以看到我们得到了,一个非常复杂的方程，结果是它在数学上是,不可能解出确定的,薛定谔方程,当我们考虑更高的电子数目的时候。

麻省理工公开课 - 化学原理课程节选