So, even though we don't have the lithium anymore, we still keep that atomic number 7 around.

尽管现在它不含锂了，但是作为原子量的七，还是在一定程度上保留了下来。

麻省理工公开课 - 化学原理课程节选

But for anything 7 or less, so what is the atomic number for nitrogen?

但对于7或者更少，对于N原子序数是多少？

麻省理工公开课 - 化学原理课程节选