If the atom is fixed mass, the electron is tiny, It must be the positives have all the mass.

如果是原子质量一定，电子很小，带正电荷的部分几乎占据了全部质量。

麻省理工公开课 - 固态化学导论课程节选

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

Furthermore, the electron has a very tiny mass in comparison to that of the overall atom.

进一步，电子的质量很小,相比于整个原子。

麻省理工公开课 - 固态化学导论课程节选

I mean, the atom has a tiny mass, too, but what we are saying is compared to the totaled atomic mass, the mass of the electron is tiny.

我的意思是，原子的质量也很小，但是我们说的是,和整个原子质量相比，电子的质量是很小的。

麻省理工公开课 - 固态化学导论课程节选