电子从最低能级到最高能级，填满轨道。

Electrons fill orbitals from lowest energy to highest energy.

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适量的能量撞击电子时，电子将吸收能量并跳跃至高能级轨道。

Hit it with just the right amount of energy, and it will absorb it, and the electron will jump up to a higher energy level.

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任何更高能级到2能级2，都是属于Balmer系，它在可见光谱中。

So anything that goes from a higher energy level to 2 is going to be falling within the Balmer series, which is in the visible range of the spectrum.

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And as you go to higher and higher levels, those energy levels, as you saw in the case of hydrogen, are more closely spaced.

当能级变得越来越高，那些高能级的轨道，就会变得越来越接近，正像你在氢原子里看到的那样。

麻省理工公开课 - 固态化学导论课程节选

And we are going to use the Pauli Exclusion Principle and we are going to use the fact that we fill from lower energy to higher energy.

我们将会用到泡利不相容定律,而且我们准备利用这个事实,那就是我们从低能级到高能级填充。

麻省理工公开课 - 固态化学导论课程节选

We start at this lower energy state and go up that means we need to absorb a photon, we have to take in energy.

我们从一个低能级开始，到一个高能级去,这意味着需要吸收一个光子，我们要获得能量。

麻省理工公开课 - 化学原理课程节选