- Then also, nitrogen, 3 minus -- these are all going to be isoelectronic with neon.

然后还有，氮，负三价-,这些都是与氖原子等电子的。

麻省理工公开课 - 化学原理课程节选

Because aluminum ions have charge of plus three and oxygen ions have charge of minus two.

因为铝离子为正三价,氧为负二价。

麻省理工公开课 - 固态化学导论课程节选