If you think about what happens when we go from hydrogen to helium, now instead of one electron, we have to describe two electrons, so now we have six position variables that we need to plug into our Schrodinger equation.

如果你们考虑,当我们从氢到氦会发生些什么，现在我们不是要描述一个电子，我们将要描述两个电子，所有我们现在将有6个位置变量,需要加入至薛定谔方程。

麻省理工公开课 - 化学原理课程节选