It is a double column, You can see, it starts with hydrogen and goes to mercury in ascending order of atomic mass.

双纵栏，你们看到，从氢开始,然后到水银，按原子质量的升序排列。

麻省理工公开课 - 固态化学导论课程节选

Imagine then from now on, we can find the mass of any object, right?

假设从现在开始,我们就能测量任何物体的质量了,对吧

耶鲁公开课 - 基础物理课程节选