Would you expect to see electron promotion for boron?

它有3个价电子？

麻省理工公开课 - 化学原理课程节选

And we can think about here we did get that energy for electron promotion that I mentioned before 2p where we moved the electron from the 2 s to the 2 p.

我们可以考虑,我们从哪里,获得了能量使电子,从2s激发到。

麻省理工公开课 - 化学原理课程节选