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

So that doesn't make a difference for us when we're talking about neutral atoms, 4s because we would fill up the 4 s first, because that's lower in energy until we fill it, and then we just keep going with the d orbitals.

所以那对我们来说没什么不同,所以当我们讨论中性原子时，因为我们会首先填充，因为在我们填充它之前它的能量都较低，然后我们继续填充d轨道。

麻省理工公开课 - 化学原理课程节选