So, just looking at putting in the electrons, filling up the energy diagram here, we should be able to see a little bit why this is happening.

那么，仅仅通过观察这些电子的位置，在能级图上如何填充，我们应该就可以看出一点端倪。

麻省理工公开课 - 化学原理课程节选

This energy level diagram helps us understand the relationship between electron filling and bond strength.

能级图能帮助我们,理解电子填充,和键强的关系。

麻省理工公开课 - 固态化学导论课程节选