Nitrogen: Gaseous chemical element, chemical symbol n, atomic number 7.

氮：气态化学元素，化学符号N，原子序数7。

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。

化学原理课程节选 : 麻省理工公开课

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？

化学原理课程节选 : 麻省理工公开课