The number of electrons in an atom is deduced to be approximately equal to half the atomic weight.

原子中的电子数,将近是原子质量的一般。

麻省理工公开课 - 固态化学导论课程节选

And when we talk about angular nodes, the number of angular nodes we have in an orbital is going to be equal to l.

当我们谈到角向节点时，一个轨道的,角向节点数等于ｌ

麻省理工公开课 - 化学原理课程节选