Remember we have to put one in each degenerate orbital before we double up on any orbital, so just keep that rule in mind that we would fill one in each p orbital before we a to the second one.

我们必须把,每一个放入简并的轨道,我们把每一个电子放在p轨道里，所以把规则记在脑子里,我们把每一个电子放在p轨道里,在我们放入第二个电子之前。

麻省理工公开课 - 化学原理课程节选