So we have four choices in terms of initial and final energy levels, and also what it means - in terms of the electron -- whether it's gaining energy or whether it's going to be emitting energy?

我们有这四个选项,各有不同的初始能量和末能量,它都是按照电子来说的,不管是失去能量还是得到能量？

麻省理工公开课 - 化学原理课程节选

p All right, then what? 2 p. After that? 3 s. Next? 3 p, that gives us five different options, five different orbitals, five different energies right there.

好，然后呢？2，p，继续？3，s，下一个？,我们有五个不同的选项，五个不同的轨道，五个不同的能量在这。

麻省理工公开课 - 化学原理课程节选