And I want to really highlight here we're talking about for a hydrogen atom orbitals - with the same n value have the same energy.

我想强调的是,我们所说的,都是对单个的氢原子,和言的,对于同样的n值能量相同。

麻省理工公开课 - 化学原理课程节选

Core electrons are all those electrons held in really tight with the nucleus in the inner shells, whereas the valence electrons are only those electrons that are in the outer-most shell, or at your highest value of n of the principal quantum number.

芯电子是那些,在内壳层被原子核束缚得非常紧的电子，而价电子只包括,最外层的电子，或者说主量子数，n，的值最大的那些电子。

麻省理工公开课 - 化学原理课程节选